Explanation : The sum 6 can be obtained as follows: (1,5), (2, 4), (3, 3), (4, 2), (5, 1), i.e. in 5 ways. Probability of A's throwing 6 with 2 dice = 5/36 Probability of A's not throwing 6 = 31/36 Similarly, probability of B's throwing 7 = 6/36, i.e. 1/6 Probability of B's not throwing 7 = 5/6 Now A can win, ifhe throws 6 in the first, third, fifth, seventh etc. throws. Chance of A's winning