题目信息
A certain university will select 1 of 7 candidates eligible to fill a position in the mathematics department and 2 of 10 candidates eligible to fill 2 identical positions in the computer science department. If none of the candidates is eligible for a position in both departments, how many different sets of 3 candidate.s are there to fill the 3 positions?
A:42
B:70
C:140
D:165
E:315
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正确答案：
E:315
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