i'm currently reading harrington's first tourney installment. in the "reading the table" section, he is outlining a situation and describing an easy call based on pot odds.

i thought that i understood the fairly straightforward concept, but this confuses me.

you're holding Qs4s. flop comes JsJc9s. it's going to cost you $200 to get into a $1000 pot. he says that "the odds of drawing a flush on the next card are about 4 to 1 against, and if you stay in for 4th and 5th street, the odds drop to 2 to 1 against."

i thought that 9 / 47 is roughly 5 to 1 odds against? did dan fuck up, or am i missing something?