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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?
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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