Question

How many number of handshakes are possible if there are 25 persons and each one will shake each others hand?

Answer 1

didnt i just answer this?

Answer 2

24+23+22 and so on.. can you think of the reason why?

Answer 3

there will be 300 shakehands.

becuase

first person will shake with 24 persons.
secong d person will shake with left out i.e 23
3rd 22
and so on......

so the total no. of shakehands= n(n+1)/2

=24 * 25/2
=300

Answer 4

wow thank you so much...it really helps..