GMAT备考本周精选+答案解析
今日练习题为数学题,题目如下
If k is a positive integer, is k the square of an integer?
(1) k is divisible by 4.
(2) k is divisible by exACTly 4 different prime numbers.
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 statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D EACH statement ALONE is sufficient.
E Statements (1) and (2) TOGETHER are NOT sufficient.
正确答案:
E
题目分析:
求K是否是一个整数的平方数
详细解法:
条件(1), K能被4整除
如果K=16,是4的平方数, 如果K=8,不是平方数,所以不充分
条件(2), K能被正好4个质数整除
最小的4个质数乘积=2*3*5*7=210
如果K=210, 不是平方数, 如果K=210*210, 是平方数, 所以也不充分
(1)+(2)相加也不充分
所以选E
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今日练习题为数学题,题目如下
If k is a positive integer, is k the square of an integer?
(1) k is divisible by 4.
(2) k is divisible by exACTly 4 different prime numbers.
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 statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D EACH statement ALONE is sufficient.
E Statements (1) and (2) TOGETHER are NOT sufficient.
正确答案:
E
题目分析:
求K是否是一个整数的平方数
详细解法:
条件(1), K能被4整除
如果K=16,是4的平方数, 如果K=8,不是平方数,所以不充分
条件(2), K能被正好4个质数整除
最小的4个质数乘积=2*3*5*7=210
如果K=210, 不是平方数, 如果K=210*210, 是平方数, 所以也不充分
(1)+(2)相加也不充分
所以选E