几道数学题求解答。

Dino-UTSC · 发表于 2019-12-6 13:43:24

在Hult的官网上做了几道题，我严重怀疑是答案错了，求大家帮忙解答一下。

1. A committee that includes 6 members is about to be divided into 2 subcommittees with 3 members each. On what percent of the possible subcommittees that Michael is a member of is David also a member?40%

2. How many 4 digit numbers are there, if it is known that the first digit is even, the second is odd, the third is prime, the fourth (units digit) is divisible by 3, and the digit 2 can be used only once?
我的答案：5x5x4x3-5x3=285
答案：300

3. What is the probability that a 4 person committee chosen at random from a group consisting of 6 men, 7 women, and 5 children contains exactly 1 woman?
我的答案： 7/18 x 11/17 x 10/16 x 9x15 = 77/816
答案：77/204

4. If n is an integer between 1 and 96 (inclusive), what is the probability that n×(n+1)×(n+2) is divisible by 8?
答案：5/8

几道数学题求解答。

所属分类: GMAT考试

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