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18 August, 18:56

Of the following numbers, which one os prime : 14,13,21,23

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  1. 18 August, 21:18
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    Prime refers to numbers that cannot be divided by any number but themselves and 1.

    14 can be eliminated, as it is even (no primes except 2 are even)

    13 has no divisors. It is prime.

    21 has 4 divisors. It is not prime.

    23 has no divisors. It is also prime.

    Two numbers of this list are prime; 13 and 23.
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