Problem Solving

试题详情

题目:

If 30!/10! is written as the product of consecutive integers, the largest of which is 30, what is the smallest of the integers?

选项:

A、1
B、3
C、7
D、11
E、20

答案:

D

提问:

希望老师帮忙解答一下这道题解题思路和考点: For 220 – k when k is a single digit integer, if 220 – k is divisible by 3, then which of the following could be a value of k? 1 4 7 Answer: 1,4,7
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提问:

不会做
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