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  • Number of positive integral solution for the equation a+b+c+d = 10 is Option: 1 84 Optio

Number of positive integral solution for the equation a+b+c+d = 10 is 

Option: 1

84 


Option: 2

120 


Option: 3

720 


Option: 4

1440 


Answers (1)

best_answer

As we have learnt,

Number of positive integral solutions (natural number solutions) of equation

x1 + x2 + x3 + ..........+ xr = n is ^{n-1}C_{r-1} , where x_{i}\geq 0

So,

Number of positive integral solution = ^{10-1}C_{4-1} = 84

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Riya

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