设电话号码由八位数组成,每位数字可以使0,1,2,……,9中任意一个,但第一位数字不能为0。现随机

2024-11-16 21:48:45
推荐回答(1个)
回答1:

9/10*8/10*7/10*6/10*5/10*4/10*3/10
=(9×8×7×6×5×4×3)/10000000
=544480/10000000
=0.0544480
≈5.445%