Identify which of the following numbers are prime:
I. 157
II. 161
III. 163

Answer Choices

Correct answer marked below

II only

III only

I & II

I & III

Correct

I, II, & III

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Explanation

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Official Explanation

Official

To determine the primality of the numbers, we analyze each one. For I, 157 is a prime number as it has no divisors other than 1 and itself. For II, 161 can be factored as 7 * 23, indicating it is not…

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Comments

AnanyaMay 10, 2024

Thank you very much!

RheaApr 7, 2025

Can someone explain it other way?

What this question tests

What it tests

Your fluency with the order of operations, fractions, decimals, and basic number sense — the foundation every quant question leans on.

Common trap

Applying the order of operations out of sequence or rounding intermediate values before the final step.

Identify which of the following numbers are prime: I. 157 II. 161 III. 163