When ten persons shake hands with one another, in how many ways is it possible?

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Q 2453734644.     When ten persons shake hands with one another, in
how many ways is it possible?
IAS 2010 Prelims
A

`20`

B

`25`

C

`40`

D

`45`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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