Wiskunde Multiple Choice Vraag uit Gricha's Wiskundige Vragenbank

De som $C_{n}^{p}+C_{n}^{p}$ kan ook geschreven worden als	A. $https://latex.codecogs.com/png.image?\dpi{150}2.\textbf{C}_{\: n}^{n-p}$
B. $https://latex.codecogs.com/png.image?\dpi{150}\textbf{C}_{2n}^{2p}$
C. $https://latex.codecogs.com/png.image?\dpi{150}\textbf{C}_{n+1}^{\; p}$
D. $https://latex.codecogs.com/png.image?\dpi{150}\textbf{C}_{\, n}^{2p}$
E. $https://latex.codecogs.com/png.image?\dpi{150}\textbf{C}_{2n}^{\: p}$

$The\;\;sum \quad \left ( \begin{matrix} n\\p \end{matrix} \right )+\left ( \begin{matrix} n\\p \end{matrix} \right ) \quad can\;\;also\;\;be\;\;written\;\;as\\ {\color{Blue} A.}\;\;2.\!\left ( \begin{matrix} n\\n-p \end{matrix} \right )\quad {\color{Blue} B.}\;\left ( \begin{matrix} 2n\\2p \end{matrix} \right )\quad {\color{Blue} C.}\;\left ( \begin{matrix} n+1\\p \end{matrix} \right )\quad {\color{Blue} D.}\;\left ( \begin{matrix} n\\2p \end{matrix} \right )\quad {\color{Blue} E.}\;\left ( \begin{matrix} 2n\\p \end{matrix} \right )$