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,,
digits, 0, 2, 4, 6, 8
=>4 * 5 * 5 * 5
答案是B
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