Problem of the Week

Problem 3

Write down the total number of all possible solutions to the equation:

$\begin{displaymath} x_1+x_2+x_3+x_4+5x_5=15 \end{displaymath}$

Where $x_1$ , $x_2$ , $x_3$ , $x_4$ and $x_5$ are non-negative integers.

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