JEE Math Practice Question
The value of $$\sum\limits_{r = 0}^{22} {{}^{22}{C_r}{}^{23}{C_r}} $$ is
- A.$${}^{44}{C_{23}}$$
- B.$${}^{45}{C_{23}}$$
- C.$${}^{44}{C_{22}}$$
- D.$${}^{45}{C_{24}}$$
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