Question

Which of these numbers is composite? Choose 1 answer: Choose 1 answer: (Choice A) A 555 (Choice B) B 313131 (Choice C) C 434343 (Choice D) D 454545 (Choice E) E 535353

Answer 1

D) 45

Explanation:

5, 31, 43, 53 are prime, which you would know if you know your multiplication tables. 45 = 5·9 is composite