Problem Solving
试题详情
题目：
If ø is a function, does a ø 1 = 1 for all a?
(1) 1 ø a = 1 for all a.
(2) a ø b = b ø a for all a and b.
选项:
A、Aif statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient;
B、Bif statement (2) ALONE is sufficient to answer the question but statement (1) alone is not sufficient;
C、Cif the two statements TAKEN TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient;
D、Dif EACH statement ALONE is sufficient to answer the question;
E、Eif the two statements TAKEN TOGETHER are still NOT sufficient to answer the question.
答案:
C
