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题库 / Prep2007E2-DS-156
Each of the numbers w, x, y, and z is equal to either 0 or 1. What is the value of w + x + y + z ?
(1) ~$\frac{w}{2}+\frac{x}{4}+\frac{y}{8}+\frac{z}{16}=\frac{11}{16}$~
(2) ~$\frac{w}{3}+\frac{x}{9}+\frac{y}{27}+\frac{z}{81}=\frac{31}{81}$~
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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只能选0或1，所以有了算式一定能算出结果
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