题目内容：
某密码由4位不同数字组成，已知各位密码之和为偶数，则密码有多少种?
A.120 B.240 C.480 D.2640
参考答案：
答案解析：
选择题：某密码由4位不同数字组成，已知各位密码之和为偶数，则密码有多少种?A.120 B.240 C.480 D.2640
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