Question posed today in class (and no, it's not supposed to be a math class...yet)
You are hosting a party, with your significant other. You invite 20 couples (yes, it must be couples). Sometime during the party, you go around and ask each person how many people he/she has shaken hands with. The person cannot have shaken his/her SO's hand, or his/her own hand. Each person gives you a different number.
How many people did your SO shake hands with?
Why do you think your answer is right? I did end up with the right answer, however, my logic was flawed. And very very wrong.
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