3 years ago

At a place 11 Friends met together and they shook their hands. how many hand-shakings did they do?

Mathematics

2 answers:

dybincka [34]3 years ago

7 0

Answer:

121

Step-by-step explanation:

Because every one of them shook with each other and one person shook 11 times so 11 into 11 is 121.

bogdanovich [222]3 years ago

6 0

Answer:

55 handshakes.

Step-by-step explanation:

n(n-1)

----------

= 11(11-1) / 2

= 11* 10 / 2

= 110 / 2

= 55

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