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OpenStudy (pratyush5):
Total number of ways in which n^2 number of identical balls can be put in n numbered boxes (1,2,3,......,n) such that box number i contains atleast i number of balls.
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OpenStudy (sparrow2):
ok first we have to put 1,2,3...n balls relevant to number this is :n(n+1)/2
OpenStudy (pratyush5):
GOt it :) Then ?
OpenStudy (sparrow2):
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