标题: 求各位大佬两道prep的题~ [打印本页] 作者: Yvonne123456 时间: 2019-2-19 21:39 标题: 求各位大佬两道prep的题~ 【PS】For every positive even integer n, thefunction h(n) is defined to be the product of all the evenintegers from 2 to n, inclusive. If p is thesmallest prime factor of h(100) + 1, then p is
【DS】How many odd integers are greater than theinteger x and less than the integer y ?
(1) There are 12 even integers greater than x and lessthan y.
(2) There are 24 integers greater than x and less than y. 作者: sxkbb 时间: 2019-2-19 22:52
第一个不是求具体数字吧，应该是求个范围或者最小值，p>50我解释一下：h(100)=2*4*6*...*100=2^50*50!
所以h(100)可以被50以内的任意正整数整除，也就是说h(100)+1除以50以内的正整数都余1，即不能被50以为的正整数整除
第二个是B吧，条件一的话奇数可能是11,12,13