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
4x5x5x5=500, 天山的答案是C, 但很多人都说是B 600, 为什么?
选500...c
原帖2楼的gg是在开玩笑,选B是指选
再说一次,选C...
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