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Question

Which of the following natural numbers are prime numbers?

A
37
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B
77
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C
103
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D
231
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Solution

The correct option is C 103The natural numbers which is divisible by 1 and itself are called prime numbers. They do not have factor other than 1. In above question, the number 37 and 103 are prime numbers because they do not have any other factor except 1 and itself the number. Whereas, the number 77 has the factors 7 and 11 along with 1 and itself, 231 have factors 3 and 11 along with 1 and itself. Hence, 77 & 231 are not prime.

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