GWD-3-5

svanlo

If (y+3)(y-1) – (y-2)(y-1) = r(y-1), what is the value of y?

(1)     r² = 25

(2)     r = 5

                   

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.

单独用条件（1）和（2）都可以解题，只不过答案是两个而已。为什么这题选E呢？是因为答案不唯一吗？