Total number of ways in which 256 identical balls can be placed in 16 numbered boxes (1,2,3,.,16) such that rth box contains at least r balls is (1≤r≤16)
A
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B
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C
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D
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Solution
The correct option is B If we put minimum number of balls required in each box, then remaining 120 balls can be put in 119C15 ways without any restriction.