Which one of the following is a prime number

Asked by admin @ 12/08/2021 in Math viewed by 301 People

25. Which one of the following is a prime number?

(a) 161 (b) 171 (c) 173 (d) 221is there any method to find directly the prime number

Answered by admin @ 12/08/2021

Answer :

Option C is the Correct Answer.

Explanation:

We have to find the prime Number among the given options; So, We will find Square root of prime Number.

√173 = 13.66 i.e 13

Those Prime numbers which are less then 13 are 2,3,5,7,11.

Here, 161 is divisible by 7, and 221 is divisible by 13.

Therefore, Option C is Correct Answer.

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