A prime number less than 70 is randomly picked, what is probability that one of its digit will be 7?

Answer 1

5/19

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There are 19 primes < 70- 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67
5 out of them have digit 7- 7, 17, 37, 47, 67
probability = 5/19