C-4-4-C-4-5-C-4-6-C-4-26-

Question Number 185350 by cortano1 last updated on 20/Jan/23

C_{4}^{4} + C_{4}^{5} + C_{4}^{6} + \dots + C_{4}^{26} = ?

Commented by mr W last updated on 24/Jan/23

= C_{4 + 1}^{26 + 1} = C_{5}^{27} = 80730

g e n e r a l l y :

\underset{k = r}{\sum^{n}} C_{r}^{k} = C_{r + 1}^{n + 1}

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