At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party? Explain your answer.
anshu140:
132 becoz one person use 1hand to hanshake
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12 people
The first one will shake hands with 11people. The second one will shake hands with 10 people but not 11 because he had already shaken hands with the first person when the first person was shaking hands. So on the third will do 9 just like that. 11+10+9+8+7+6+5+4+3+2+1. =66 handshakes
The first one will shake hands with 11people. The second one will shake hands with 10 people but not 11 because he had already shaken hands with the first person when the first person was shaking hands. So on the third will do 9 just like that. 11+10+9+8+7+6+5+4+3+2+1. =66 handshakes
9 going 10
And you?
10
now my exam
r u girl na
No
ooo
boy na
Yeah
h; mmm
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