Simple Arithmetic

Level pending

How may solutions are there so that \[ a + b + c + d + e = 20 \] where \(a, b, c, d, e > -1 \) ?

For example,
\(a + b = 3\) have 4 solutions :
\(a = 0, b = 3\)
\(a = 1, b = 2\)
\(a = 2, b = 1\)
\(a = 3, b = 0\)

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