21
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Which of these numbers is a composite number?
A.
31
B.
41
C.
51
D.
61
It is: 29 because it has only two factors which are itself and one
It is e: 29
They are all prime numbers except for 15 21 25 and 27 which are composite numbers
It is 23
29
The prime numbers among the given list are 23 and 29. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. In this case, 23 and 29 have no divisors other than 1 and the numbers themselves, making them prime. The other numbers in the list have divisors other than 1 and themselves, so they are not prime.