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113 bytes removed
, 10:27, 2 February 2015
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| <math> | | <math> |
| \begin{align} | | \begin{align} |
− | F(P,A) = \begin{cases} | + | F(P,A) = \binom{P+A-1}{A-1} \\ |
− | \binom{P+A-1}{A-1} &, A < P \\ | |
− | \sum_{i=1}^{P-1} \binom{A}{i}\binom{P-1}{i-1} + \binom{A}{P} &, A \ge P
| |
− | \end{cases}
| |
| \end{align} | | \end{align} |
| </math> | | </math> |