I went to attend my friend's birthday party. I just counted the total no of handshakes made in that . It came to 45. Can you tell me how many persons were there?

( Actually there is a formulae to calculate this.If you can tell that also it will be very nice as that will work for any number.)

So, give your brain a little work and guess :)

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i think there were 15 people who you might have done handshake each of them you did it 3 times continous
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