If INTEGer n is greater than 1? IS N EQUAL TO to 2 ?

1) N has exactely 2positive factors

2) The difference of any 2 distinct positive factors of n is odd

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1) All the prime numbers have exactly 2 positive factors. Insufficient.

2) N and 1 are always distinct positive factors of N, and N-1 should be odd.

Thus, N should be an even number.

However, if N is bigger than 2 and contains 2 (like 4, 6, 8 ...), N - 2 is even! Therefore, only 2 is possible. Sufficient.

(B) should be it.

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