GMAT考试

【单选题】The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. Yon have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether
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 statementALONE、is sufficient.
D、EACH statementALONE、is sufficient.
Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.
If a≠0, is b greater than zero
(1) a+b=10
(2) ab=24
网考网参考答案：C
网考网解析：
alone is insufficient because either a or b could be a negative number, e. g., (12,-2), (-2,12). (2) alone is insufficient, because a and b could both be negative or both be positive, e.g., (-2,-12), (2,12). If both statements are combined, we know that both a and b must be positive, because if they were both negative, statement (1) would be impossible. The answer to the question is "yes. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>