Question

t a conference, 12 members shook hands with each other before & after the meeting. How many total number of hand shakes occurred?

Answer 1

N=n(n−1)÷2

For example there are 12 people he

So

N=12(12–1)÷2=132÷2=66

That's for once but they handshaked after the meeting so

66∗2=132

Hope this helps!

~LENA~