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题库 / GMATAdvanced-DS-69
If m and n are positive integers, is n even?
(1)m(m+2)+1=mn
(2)m(m+n)is odd.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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2: m(m+n)=odd m只能是odd-m是even的话这个条件就不成立。 m=odd. odd*n=odd-odd^2=even even/odd=even. 所以n是even。
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