Question

Which statement is true?

A. The number 39 is prime, but 40 is composite.
OB. The number 33 is prime, but 38 is composite.
OC. The number 43 is prime, but 39 is composite.
OD. The number 51 is prime, but 26 is composite.

Answer 1

C.

Explanation:

A. 39 = 3 × 13; not prime

B. 33 = 3 × 11; not prime

C. 43 = 1 × 43; prime

D. 51 = 3 × 17; not prime

Answer: C.