A man has 10 friends whom he wants to invite for dinner. The number of ways in which he can invite exactly 3 of them is?


2 Answers

Corey Levesque Profile
Corey Levesque answered

I would need a pencil and some paper to figure that out. Probably like 50.. Or 100. Maybe 300

John McCann Profile
John McCann answered

Not sure, but...,

10!/(10 - 3)!


= 720 ways

======Looks high to me, but I am too lazy to get my statistics book out! Hopefully Mike J. Will see this.

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