Question

Choose the one which is different from the rest three-

• A. 71
• B. 57
• C. 37
• D. 17

Hint:

For number groups, first check if the numbers are prime or composite; the odd one out usually differs in this property.

Answer 1

The Correct Option is B

Step 1: Identify the nature of each number.
\(71\) is a prime number (divisible only by 1 and 71).
\(57\) is not a prime number; it is composite.
\(37\) is a prime number.
\(17\) is a prime number.
Step 2: Confirm the composite nature of 57.
Check factors of 57:
\[ 57 = 3 \times 19, \] so it has divisors other than 1 and itself.
Step 3: Conclude the odd one out.
Since 57 is the only composite number among the prime numbers, it is the odd one out.