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11 At a local sports club, 15 17 20 of the members play tennis and racquetball. play tennis. If a member is selected at

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11 At a local sports club, 15 17 20 of the members play tennis and racquetball. play tennis. If a member is selected at random, and that member plays tennis, find the probability that he/she also plays racquetball. How many phone numbers are possible in the (770) area code if: For the form ABC- XXXX, A is restricted to numbers 2-8, but B, C, and X can be any digit 0-9, including repetitions.

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