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  Is the sum of the integers x and y a prime number?

  (1) x is an even prime number.

  (2) y is a prime number between10 and 20.

  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 NOTsufficient.

  参考答案:E

  题目翻译:x和y的和是不是质数?

  题目全解:(1)2 is the only prime even number. We don't know what Y is. Insufficient;

  (2)Y can be 11,13,... We don't know what X is. Insufficient;

  Together,2+11 = 13 Prime; 2+13 = 15 not Prime. Insufficient.

  Hence E.

  What is the value of v^3 – k^3?

  (1) vk > 0

  (2) v – k = 6

  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 NOTsufficient.

  参考答案:E

  题目翻译:v^3 – k^3的值是多少

  题目全解:(1)v*k大于0,in;

  (2)v-k=6,in;

  (1)+(2),无法得出结论,in。

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