Everyone at a party shook hands. There were 210 handshakes in all. How people attended the party?
Stacey Warren - Expert brainly.com
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Have you tried anything so far?
Oh, nothing? :(
OK, let's start with looking at some small cases and try and find a general pattern.
If two people go, the first person shakes hands with the second, and that is it.
1-> 2, 3
And we are done.
You could try looking at slightly larger groups, but you may notice a pattern soon?
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is what iNewton said make sense?
the pattern should lead you to combinations
there are 210 possible handshakes among n people
handshake takes 2 people so there are 210 pairs among n people
nC2 = 210
n!/(n-2)!*2! = 210
solve for n