由数字1,2,3,4组成五位数a1a2a3a4,从中任取一个,求取出的书满足条件:求对任意正整数j(1
由数字1,2,3,4组成五位数a1a2a3a4a5,从中任取一个,求取出的书满足条件:求对任意正整数j(1