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Quantitative Aptitude

Pascal Triangle

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Question

Find the number of non-negative integral solution of $x_{1} + x_{2} + x_{3} + 4 x_{4} = 20$ .

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Solution

$x_{1} + x_{2} + x_{3} + x_{4} = 20$
$20 + 7 - 1 = 26$
$C_{7 - 1} = C_{6}$

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