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The number of ways in which we can n+p things into two groups is given by:- (n+p)!/n!p! if n=p then in books it is written number of ways become (2n)!/n!n!2! why additional 2! can someone explain, PLZ?

The number of ways in which we can n+p things into two groups is given by:-


(n+p)!/n!p!


if n=p then in books it is written number of ways become


(2n)!/n!n!2! 


why additional 2! can someone explain, PLZ?

Grade:11

1 Answers

SOHAN SARANGI
18 Points
10 years ago

Becoz when two similar type of objects are taken we have to divide by 2!.So here also we have n+n typesm of objects and so we have divide by 2!

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