Out of 15 consecutive numbers, 2 are chosen at random. The probability that they are both odds or both primes is
Options:
(A) 10/17
(B) 10/19
(C) 46/105
(D) 11/15
(E) Cannot be determined Think first, then make a decision. Some random thoughts:
There is no definite formula for finding prime numbers among 15 consecutive numbers. Hence the probability cannot be determined. So the answer is (E).