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Every body in a room shakes hand with ev...

Every body in a room shakes hand with every body else. The total number of hand-shakes is 66. The number of persons in the room is

A

10

B

33

C

24

D

12

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  3. Every body in a room shakes hand with every body else. The total numbe...

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  13. What is the smallest natural number n such that n ! is divisible by 99...

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