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Question

If x1+x2+x3+x4+x5=6, then the difference between the number of non negative integral solutions and the number of positive integral solutions will be

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Solution

x1+x2+x3+x4+x5=6
Number of non negative integral solutions
=6+51C51=10C4=210
Number of positive integral solutions
=61C51=5C4=5
Difference =2105=205

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