$\begin{array}{1 1}(A)\;72\\(B)\;71\\(C)\;36\\(D)\;\text{None of these}\end{array} $

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- $C(n,r)=\large\frac{n!}{r!(n-r)!}$

After giving 1 mark to each question,7 marks to be distributed among 3 question.

The required number of ways =The number of non-negative integral solution of x+y+z=7

$\Rightarrow 9C_7=9C_2$

$9C_2=\large\frac{9!}{2!7!}=\frac{9\times 8\times 7!}{2\times 7!}$

$\Rightarrow 36$

Hence (C) is the correct answer.

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