Gmat数学题：How many integers between 1 and 100,inclusive,can be divided by none of 2,3,and
问题描述：
Gmat数学题：How many integers between 1 and 100,inclusive,can be divided by none of 2,3,and
答
1到100 共100个数,偶数能被2整除,有50个,扣掉被5整除的找尾数是5 或10 就行,这里找尾数是5的（尾数是10的已经算在偶数内）有10个被3整除的情况,每30一个周期,如 3 9 21 27； 33 39 51 57,发现规律没有?所以是3*4+2=1...