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Q: Which of the following is a prime number?
  • A. 143
  • B. 173
  • C. 123
  • D. 213
Correct Answer: Option B - Prime number are the numbers, which are only divisible by 1 and itself. From the given options- (a) 143 is divisible by 11, so it is not a prime number. (b) 173 is divisible by 1 and itself, so it is a prime number. (c) 123 is divisible by 3, so it is not a prime number. (d) 213 is divisible by 3, so it is not a prime number.
B. Prime number are the numbers, which are only divisible by 1 and itself. From the given options- (a) 143 is divisible by 11, so it is not a prime number. (b) 173 is divisible by 1 and itself, so it is a prime number. (c) 123 is divisible by 3, so it is not a prime number. (d) 213 is divisible by 3, so it is not a prime number.

Explanations:

Prime number are the numbers, which are only divisible by 1 and itself. From the given options- (a) 143 is divisible by 11, so it is not a prime number. (b) 173 is divisible by 1 and itself, so it is a prime number. (c) 123 is divisible by 3, so it is not a prime number. (d) 213 is divisible by 3, so it is not a prime number.