If a, b, and c are integers, what is the value of a ?
(1) (a - 7)(b - 7)(c - 7) = 0
(2) bc = 18
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.
有(1)单独不充分,但可以得出只要其中任何一个乘数等于零,式子就会等于零。
由 (2)得出, bc不等于零
所以联立起来,可以得出a-7=0. 所以a=7