Which one of the following numbers is NOT a prime number?
Given:
Options: 231, 313, 211, 241
Concept Used:
A prime number has exactly two distinct positive divisors: 1 and itself.
Solution:
231:
Sum of digits = 2 + 3 + 1 = 6 → divisible by 3
231 is divisible by 3 → Not prime
313 → Prime
211 → Prime
241 → Prime
Thus, option (a) is right.
English
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