13is it 135C15
Total no. of ways in which 256 identical balls can be placed in '16' numbered boxes (1,2,3,...16) such that rth box contains atleast 'r' balls is (1≤r≤16)
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3 Answers
13no. of balls placed in '16' numbered boxes (1,2,3,...16) such that rth box contains 'r' balls (1≤r≤16) is 16*17/2=136
ball remaining 120
these balls can be placed in any box in 120+16-1C16-1ways