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The number of non-negative integral solu...

The number of non-negative integral solution `x_1 + x_2 + x_3 + x_4 <=n` (where n is a positive integer) is :

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`x_1+x_2+x_3+x_4<=n`
`x_6+x_1+x_2+x_3+x_4=n`
`(n+r-1)C_(r-1)=(n+5-1)C_(5-1)=(n+4)C_4`
option d is correct.
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