Question

3. Which of the following is a prime number?
(a) 81
(b) 87
(c) 91
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Answer 1

Answer:

the answer of this question is option number none

Answer 2

Answer:

The answer is 91

Step-by-step explanation:

It would have been required that 91 has only two divisors, i.e., itself and 1. However, 91 is a semiprime (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 91 = 7 x 13, where 7 and 13 are both prime numbers