In a group of 25 boys, nine are members of the chess club (C), eight are members

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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. This information is shown in the Venn diagram.


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.

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