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Find the number of positive integral sol...

Find the number of positive integral solutions of `x_(1)x_(2)x_(3)x_(4)=1050`.

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The correct Answer is:
640
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Assertion (A) : The number of positive integral solutions of x_(1)+x_(2)+x_(3)=10 is 36. Reason (R) : The number positive integral solutions of the equation x_(1)+x_(2)+x_(3)+.......+x_(k)=n is ""^(n-1)C_(k-1) , The correct answer is

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