\[\left( \begin{matrix} n \\ n-r \\ \end{matrix} \right)\,+\,\left( \begin{matrix} n \\ r+1 \\ \end{matrix} \right)\], whenever \[0\le r\le n-1\]is equal to [AMU 2000]

\[\left( \begin{matrix} n \\ r-1 \\ \end{matrix} \right)\]

\[\left( \begin{matrix} n \\ r \\ \end{matrix} \right)\]

\[\left( \begin{matrix} n \\ r+1 \\ \end{matrix} \right)\]

\[\left( \begin{matrix} n+1 \\ r+1 \\ \end{matrix} \right)\]

\[\left( \begin{matrix} n \\ n-r \\ \end{matrix} \right)

1.	\[\left( \begin{matrix} n \\ n-r \\ \end{matrix} \right)\,+\,\left( \begin{matrix} n \\ r+1 \\ \end{matrix} \right)\], whenever \[0\le r\le n-1\]is equal to [AMU 2000]
A.	\[\left( \begin{matrix} n \\ r-1 \\ \end{matrix} \right)\]
B.	\[\left( \begin{matrix} n \\ r \\ \end{matrix} \right)\]
C.	\[\left( \begin{matrix} n \\ r+1 \\ \end{matrix} \right)\]
D.	\[\left( \begin{matrix} n+1 \\ r+1 \\ \end{matrix} \right)\]
Answer» E.

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\[\left( \begin{matrix} n \\ n-r \\ \end{matrix} \right)\,+\,\left( \begin{matrix} n \\ r+1 \\ \end{matrix} \right)\], whenever \[0\le r\le n-1\]is equal to [AMU 2000]

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