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Which of the following numbers is a prime number?
  • a)
    91
  • b)
    81
  • c)
    87
  • d)
    97
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following numbers is a prime number?a)91b)81c)87d)97Corre...
We know that the factors of
91 = 1 × 7 × 13
81 = 1 × 3 × 3 × 3 × 3
87 = 1 × 3 × 29
97 = 1 × 97
Hence, 81, 87 and 91 are not prime numbers.
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