2. 外语
  3. The buyer of a certain mechanical toy must choose 2 of 4 optional motions and 4 of 5 optional accessories. How many different co

The buyer of a certain mechanical toy must choose 2 of 4 optional motions and 4 of 5 optional accessories. How many different co

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问题 The buyer of a certain mechanical toy must choose 2 of 4 optional motions and 4 of 5 optional accessories. How many different combinations of motions and accessories are available to the buyer?
选项 A、8
B、11
C、15
D、20
E、30
答案E
解析 一购买机械玩具的顾客必须从4个可选择的机械装置中选择2个，且从5个附件中选择4个，问共有多少种不同机构装置和附件的组合可供这个顾客选择?
解：本题的正确答案为(E)。总的组合数为
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