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Prime numbers

Which of the ...

Question

Which of the following is a prime number?

A

42

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B

23

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C

46

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D

26

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Solution

The correct option is B 23
Prime numbers are the numbers which have only one and the number itself as its factors.
23 has only two factors, 1 and 23 . Hence it is a prime number.

The other numbers 42 ,26,46 have more than two factors and hence they are not prime numbers.

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