[求助]天山 4-Q22

woodruff1

天山 4-Q22 math

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

各位NN幫幫忙 ,,我,,我竟然看不太懂題目在幹麻,,

dhhgh11

digits, 0, 2, 4, 6, 8

=>4 * 5 * 5 * 5

答案是Ｂ

woodruff1

thanks    a    lot  !!!!