GWD 12-19

invisiblewys

Q19:

How many 4-digit positive integers are there in which all 4 digits are even?

A. 625

B. 600

C. 500

D. 400

E. 256

luoye1

千位有4个选择2,4,6,8

其他三位有5个选择0，2，4，6，8

总共是4*5*5*5=500

sportman

ding !!!!!!!