Math, asked by Anonymous, 1 year ago

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Answered by Anonymous

1

Answer:

12

Step-by-step explanation:

Let there be n person

Total no of shake hands

= nC2= 66 = 1/2(n-1) =66

=n² - n - 132=0

(n+11)(n-12)=0

n can't be -11 so n=12

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