You had 8 people In your project，one more person will be joining next week．You know that once the ne...

You had 8 people In your project，one more person will be joining next week．You know that once the new person joins，the number of communication channels will increase by______．

A.No change in number of communication channels
B.8
C.12
D.20

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参考答案: B

参考解析: [解析] 在你的项目内有8个人，下周会再来一个人。你知道一旦新人加入，沟通渠道会增加______条。
A) 沟通渠道数量没有变化 B) 8
C) 12 D) 20
原来8个人时，沟通渠道为8×(8-1)/2=28条；当人员增加为9个人时，9×(9-1)/2=36。所以，沟通渠道增加了36-28=8条。这种题注意：是问增加到了多少?还是增加了多少?

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