This may be a case of the blind leading the blind as I am just learning this. But look at page 48 which uses combinations to get odds for a flush draw(9 outs)with two to come.The odds of making a flush by the river on the flop are 1.85 to 1 ( rounded to 1.9 in the table on page 105)The odds against making a flush draw on the river, given that you have missed it on the turn, are 46-9:9 or 4.1:1 which is the same as the table on page 112. Steve