Question
Download Solution PDFWhich one of the following is not a prime number?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Options: 31, 61, 71, 91
Formula used:
A prime number is a number greater than 1 that has no divisors other than 1 and itself.
Calculation:
Check divisibility of each option:
31: Divisors are 1 and 31 ⇒ Prime.
61: Divisors are 1 and 61 ⇒ Prime.
71: Divisors are 1 and 71 ⇒ Prime.
91: Check divisibility:
⇒ 91 is divisible by 7 and 13 ⇒ Not Prime.
∴ The correct answer is option (4).
Last updated on May 26, 2025
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