Denis. I suspect that the original post is badly worded and that mackdaddy may have deciphered it correctly. If the actual question says that 56 PERCENT of electronic gamers play online and that 64% of the gamers who play online are female, then the probability of picking an electronic gamer who is male and an online gamer is indeed p(M + O) = p(M|O) * p(O) = 0.56 * (1.00 - 0.64) = 0.56 * 0.36 = 0.2016 = 20.16%. Obviously, if the original post is correct, then your post is correct, but the original post does not make much sense. Mackdaddy could have improved the clarity of his answer by explaining what question he was answering, but this was effectively his first post as a tutor.number of players is irrelevant; we have 64% female, so 36% male.