9. In a group of 25 boys, nine are members of the chess club (C), eight are members of the debating club (D) and 10 are members of neither of these clubs. 25 - 9 D (a) Find the values of a, b and c. (b) Find the probability that a randomly selected boy is: (i) a member of the chess club or the debating club (ii) a member of exactly one of these clubs 10 8

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