To determine which of the groups is different from the others, we need to analyze each set of numbers and look for patterns or properties that distinguish them. Specifically, we will examine if the numbers in each group satisfy certain properties like being prime numbers.

Let's verify each option:

Option A: 17, 37, 47, 97

We know that a prime number is a number greater than 1 that has no positive divisors other than 1 and itself.

Checking each number in this group:

17 is a prime number.
37 is a prime number.
47 is a prime number.
97 is a prime number.

All numbers in Option A are prime numbers.

Option B: 31, 41, 53, 67

31 is a prime number.
41 is a prime number.
53 is a prime number.
67 is a prime number.

All numbers in Option B are prime numbers.

Option C: 71, 73, 79, 83

71 is a prime number.
73 is a prime number.
79 is a prime number.
83 is a prime number.

All numbers in Option C are prime numbers.

Option D: 83, 89, 91, 97

83 is a prime number.
89 is a prime number.
91 is not a prime number. It can be divided by 7 and 13 ($$ 91 = 7 \times 13 $$).
97 is a prime number.

We observe that 91 in Option D is not a prime number, while all other numbers in the other options are prime numbers.

Therefore, the group that is different from the others is Option D because it contains a number (91) that is not a prime number.

Classification · Logical Reasoning and General Mental Ability · UPSC Civil Service

MCQ (Single Correct Answer)