Brain Teaser: How Many Handshakes?

22 Jan

If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?

Put your answers in the comments and check the answers page tomorrow to see if you’re right. Good Luck!

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Diede School

The answer to this mind teaser is more on probability. Hehe. I remember this when I had Trigonometry back then in high school. If two persons are not allowed to shake each others’ hand twice, that means no repetition. Hmmm… I came up with the number 21.

Maggie Parsons

i think there will be 14 hand shakes!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!:):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):):)

jhuhi

21 handshakes....6+5+4+3+2=21...hmmm let say the first person shakeshand wid no.2,no.3,no.4,no.5, no.6 n no.7.....similarly da 2nd person is gonna shakehands wid da rest ppl leaving da 1st person since its alrealy done:D...n later da 3rd person shakeshand wid da rest leaving 1st n 2nd person...n so on

Ste

The answer is 22!!! Just let me know i was right yeah :-) If not just give me a thumbs down but i'm pretty damn sure i got this one, even after a few beers!!! :P