Friends,

There was a friends get together event, after a long time. And everyone shake hands with every friend.

If there was total #66 handshakes, find the number of friends met up that evening.

Have a good day!

Cheers!

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In this blog u can see lotz of brain teasers , puzzles , code snippets , . . . and so on

Friends,

There was a friends get together event, after a long time. And everyone shake hands with every friend.

If there was total #66 handshakes, find the number of friends met up that evening.

Have a good day!

Cheers!

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Comments

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answer is 12.

consider n people. making

n*(n-1) handshakes. however each handshake is considered twice in this case so n*(n-1)/2.

So

n*n-1=132

n^2-n-132=0

n=12 or n=-11

So the answer is 12!

Hi Sriya,

Bingo!! You are correct!

Keep trying hard ones.

Cheers