The number of positive integral solutions of the equation $x_{1} + x_{2} + x_{3} + x_{4} = 10$ is

^{9} C_{6}

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^{10} C_{4}

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^{9} C_{4}

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^{10} C_{5}

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Solution

The correct option is A $^{9} C_{6}$
Required number of solution is $=^{10 - 1} C_{4 - 1} =^{9} C_{3} =^{9} C_{6}$

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