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Toasty's Math Puzzel 1

  
 
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Toasty
Old 06-30-2004, 12:51 PM     Post subject: Toasty's Math Puzzel 1 #1 (permalink)  
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I thought I'd liven up the forum a little with some off topic stuff.

Scenario:
There are five fence pannels and three pots of paint. One Blue, one Red and one Green. Every panel needs to be painted.

Example

Blue Blue Red Red Green

How many ways can you paint the fence panels using all three colors?

There is more than enough paint.
Poker is all about the long long long long long long long term . . .
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xbones
Old 06-30-2004, 01:14 PM #2 (permalink)  
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God, years since I did this, My guess would be 20, (5!/3!)
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heatman
Old 06-30-2004, 01:33 PM #3 (permalink)  
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Fifteen.
"Limit poker is a science, but no-limit is an art..."
 
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heatman
Old 06-30-2004, 01:34 PM #4 (permalink)  
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I mean, fifteen?
"Limit poker is a science, but no-limit is an art..."
 
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Toasty
Old 06-30-2004, 01:36 PM #5 (permalink)  
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No correct answers so far.
Poker is all about the long long long long long long long term . . .
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heatman
Old 06-30-2004, 01:38 PM #6 (permalink)  
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Point of clarification...

Is it okay to have all panels the same color, or do you mean you have to use all three colors? i.e. is Blue, Blue, Blue, Blue, Blue an option?
"Limit poker is a science, but no-limit is an art..."
 
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Toasty
Old 06-30-2004, 01:57 PM #7 (permalink)  
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You have to use all three colors, but you can use 1 color more than once, obviously otherwise it would be impossible :P

RRRBG
Poker is all about the long long long long long long long term . . .
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xbones
Old 06-30-2004, 02:02 PM #8 (permalink)  
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153 Just a random guess.
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jmrogers7
Old 06-30-2004, 02:03 PM #9 (permalink)  
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1800
"The urge to gamble is so universal and it's practice is so pleasurable, that I assume it must be evil." - Heywood Broun
 
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Old 06-30-2004, 02:05 PM #10 (permalink)  
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The answer is 42
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Toasty
Old 06-30-2004, 02:08 PM #11 (permalink)  
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Quote:
Originally Posted by xbones
The answer is 42
Nope
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Yeah
Old 06-30-2004, 02:18 PM #12 (permalink)  
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Is it a trick question??

6 - would be my answer if it was
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Old 06-30-2004, 02:20 PM #13 (permalink)  
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nevermind, didn't read the example -
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xbones
Old 06-30-2004, 02:31 PM #14 (permalink)  
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158
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Old 06-30-2004, 02:39 PM #15 (permalink)  
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I am assuming order matters.

As in red, red, blue, blue, green different from green, blue, blue, red, red

Is this true?
I don't know what they have to say
It makes no difference anyway.
Whatever it is...
I'm against it.
 
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Toasty
Old 06-30-2004, 02:45 PM #16 (permalink)  
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No one has it yet but someone has come close.

Its visually based, as long as another isn't visually the same and uses 3 colors it counts, i.e. RRRBG - GBRRR - RRRBG - GGGBR
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heatman
Old 06-30-2004, 02:50 PM #17 (permalink)  
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So, if you didn't have to use all three colors, I think the answer is 243.

You've got three choices for each panel. Since order matters, these are independent choices, ie you've got three choices for panel 1, then for each color you pick for panel 1, you've got three choices for panel 2, or nine different combinations for two panels, then for each one of these you've got three choices for panel 3, etc. etc. etc. Thats 3X3X3X3X3 = 3^5 = 243

Then, you have to figure out how many 2 color and one color combinations there are. There are 3 one color combinations. That means we're down to 240.

Using the same reasoning above, I'd guess there are 2^5 = 32 two color comos. So my new, and final guess is 208.
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xbones
Old 06-30-2004, 02:54 PM #18 (permalink)  
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Quote:
Originally Posted by xbones
158
I meant 148
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Toasty
Old 06-30-2004, 02:58 PM #19 (permalink)  
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Heatman's method would give him the answer but he has missed something.

XBones Is close but no cigar
Poker is all about the long long long long long long long term . . .
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heatman
Old 06-30-2004, 03:02 PM #20 (permalink)  
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I'm all in!
"Limit poker is a science, but no-limit is an art..."
 
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heatman
Old 06-30-2004, 03:03 PM #21 (permalink)  
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Thats my usual response when the math gets too hard!
"Limit poker is a science, but no-limit is an art..."
 
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xbones
Old 06-30-2004, 03:06 PM #22 (permalink)  
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My reasoning is:

I can have 1, 2 or 3 Reds.

Case 1 : 3 reds; there are 9 diff ways 3 reds can be on the fences, and only (2^2)-2 = 2 ways the rest can be Chosen, hence 9*2= 18

Case 2 : 2 Reds 10 diff ways , and (2^3)- 2 = 6 hence 10*6 = 60

Case 3 : 1 red Can be in 5 places, and (2^4)-2 = 14 hence 5*14 = 70
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Toasty
Old 06-30-2004, 03:26 PM #23 (permalink)  
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Case 1 is incorrect
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Yeah
Old 06-30-2004, 03:27 PM #24 (permalink)  
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147 ( 120+27 )= 147
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Toasty
Old 06-30-2004, 03:34 PM #25 (permalink)  
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Yeah - You are close, you have made a mistake and I know what it is as I done the same thing
Poker is all about the long long long long long long long term . . .
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xbones
Old 06-30-2004, 03:37 PM #26 (permalink)  
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Ah, 10 * 2 so is it 150?
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Toasty
Old 06-30-2004, 03:50 PM #27 (permalink)  
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and we have a winner!!!

We have 3 colors and 5 panels.

Step 1

Total combinations therefore are 3^5=243

Step 2

We now need to remove all the combinations where only 2 or less are used.

2^5=32 We have 3 combinations of paint Red/Blue Red Green Blue/Green

(2^5)*3=96

243-96=147

Step 3

We now have 147 however in step two we removed all red/blue/green combinations twice. i.e. once for Red/Blue and once for Red/Green which would remove RRRRR twice.

We add this 3 back to arrive at 150

Answer = 150
Poker is all about the long long long long long long long term . . .
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vasumi
Old 07-01-2004, 05:53 AM #28 (permalink)  

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very cool
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Old 07-01-2004, 06:49 AM #29 (permalink)  
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LockLow34
Old 07-01-2004, 10:37 AM #30 (permalink)  
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Doing a brute force count, it looks like 36...erm, I mean 243...um, I mean 120

Actually one of my early answers was 243, but that seemed like too many and I wasn't awake enough to commit to memory how I arrived at 120:

RRR--
R-RR-
R--RR
RR-R-
RR--R
R--RR
-RRR-
-RR-R
-R-RR
--RRR

that's 10 different positional combinations for any one color, meaning 30 (3*10) different positional combinations if we are given 3 and only 3 colors

for each positional combinations where 3 of one color is present, there are also 2 different positional combinations for each of the other colors

example:
GBRRR
BGRRR
RBGGG
BRGGG
RGBBB
GRBBB

that gives 60 total possibilities when 3 of one color is present

RR---
R-R--
R--R-
R---R
-RR--
-R-R-
-R--R
--RR-
--R-R
---RR

interesting...there are ALSO 10 possible positional combinations when only 2 positions are taken up by one color

That means there are 20 possible positional combinations for each combination of 2 colors, giving 60 (20*3 combinations of 2 colors[RB, RG, BG] holding 2 positions each)

That's 120 possible positional combinations when 2 or 3 colors is present

Tell me what I missed
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Toasty
Old 07-01-2004, 11:03 AM #31 (permalink)  
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I actually done a forced count first using 20,000 random numbers five in length between one and three. I then eliminated duplicates to arrive at 243 total combinations.
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