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Which of the following is a prime number?
  • a)
    9
  • b)
    21
  • c)
    17
  • d)
    15
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is a prime number?a)9b)21c)17d)15Correct answer...
A prime number has exactly two distinct positive divisors: 1 and itself. The number 17 meets this criterion since its only divisors are 1 and 17. Recognizing prime numbers is crucial in number theory and has applications in cryptography.
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