Each person has two genes for cystic fibrosis. Each gene is 1 point either N or C. Each child receives one gene from each parent. If your genes are NN or NC or CN, then you don\'t have cystic fibrosis, otherwise you do. Harry and Sally plan on having a child, find the probability that it will have cystic fibrosis, given that neither Harry nor Sally has it. O 0.2198 O 0.0953 O 0.1219 O 0.1864 Solution 52 balls, 5 black and 47 white: probability is 5/52 * 4/51 * 3/50 * 2/49 * 1/48 = A option 4 of a kind and one unmatched in poker: We have to choose one set of 4 from 13 sets in 13C1 ways Remaining 1 card in 48C1 ways Probability = 13C1 * 48C1/52C5 = 0.00024.....B option.