Question

12 people at a party shake hands once with everyone else in the room.How many handshakes took place?

A) 72 B) 66 C) 76 D) 64

Answer 1

Answer:

your answer is 66

Step-by-step explanation:

There are 12 people, so this is our n value.

So, 12C21= 66

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Answer 2

Answer:

B)66

Step-by-step explanation:

If there were 12 people in the party then the total handshakes would be 12x11=132,

Therefore now the no. is the doble counting of the total no. Therefore to find half of the no....

We would divide 132/2

Therefore the ans is 66

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