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[求助]GWD-6-13

Q13:

What is the remainder when the positive integer n is divided by 3?

(1) The remainder when n is divided by 2 is 1.

(2) The remainder when n + 1 is divided by 3 is 2.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

How to sovle such question? thanks!!

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Hold fast to dreams, for if dreams die, life is a broken winged bird that cannot fly.

我认为是B,条件1,n=2m+1,条件2,n+1=3m+2可以推出n=3m+1,所以余数是1,足够了.
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