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Maths-

General

Easy

Question

The sum $stretchy sum from k equals 1 to n minus gamma plus 1 of k to the power of n minus k end exponent C subscript gamma minus 1 end subscript$ is equal to

$^{n + 1} C_{γ + 1}$
$^{n + 1} C_{γ} - 1$
$^{n + 1} C_{γ} +^{n - γ} C_{r}$
$^{n + 1} C_{γ + 1} - (r + 1)$

The correct answer is: $blank to the power of n plus 1 end exponent C subscript gamma plus 1 end subscript$

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