Question

S is the set of prime numbers that are less than 15

A. {2, 3, 5, 7, 11, 13}
B.{2, 3, 5, 7, 9, 11, 13}
C.{1, 3, 5, 7, 9, 11, 13}
D.{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}

Answer 1

A

Explanation:

These are all prime numbers. We know it will not be B C and D because they include numbers that are 15, or that are not prime.

Answer 2

The answer is A. It is not B because 9 is the product of 3 x 3. It can't be C because 1 is only the product of 1 x 1.