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问个数学题，谢谢大家了
A certain law firm consists of 4 senior partners and 6 junior partners. How many different groups of 3 partners can be formed in which at least one member of the group is a senior partner? (Two groups are considered different if at least one group member is different.)
(A) 48
(B) 100
(C) 120
(D) 288
(E) 600
用分类列出的方法能算出答案100来着，但是用C4 1 *C9 2，算出来的是144，想不出这方法哪里出了问题，求能人解答，谢谢了 |
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