Choose the group which is different from the others:
- A17, 37, 47, 97
- B31, 41, 53, 67
- C71, 73, 79, 83
- D83, 89, 91, 97Correct
Explanation
To determine the correct group, we must examine the properties of the numbers in each option.
Option A contains 17, 37, 47, and 97. All of these are prime numbers. Option B contains 31, 41, 53, and 67. All of these are prime numbers. Option C contains 71, 73, 79, and 83. All of these are prime numbers. Option D contains 83, 89, 91, and 97. In this group, 91 is not a prime number because it is divisible by 7 and 13 (7 times 13 equals 91).
Since groups A, B, and C consist entirely of prime numbers, while group D contains a composite number, group D is the one that is different from the others.
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