A) \[^{n}{{C}_{n-r}}\]
B) \[^{n}{{C}_{r}}\]
C) \[^{n-1}{{C}_{r}}\]
D) \[^{n+1}{{C}_{r}}\]
Correct Answer: D
Solution :
\[^{n}{{C}_{r-1}}\,+{{\,}^{n}}{{C}_{r}}\,={{\,}^{n+1}}{{C}_{r}}\] is a standard formula.You need to login to perform this action.
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