You had 8 people In your project，one more

问题单项选择题

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

答案

参考答案：B

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