"^45C8+ sum(k=1)^7 "^(52-k)C7+sum(i=1)^5...

`"^45C_8`+` sum_(k=1)^7 ``"^(52-k)C_7`+`sum_(i=1)^5``"^(57-i)C_(50-i)`=

A

1) `"^52C_7`

B

2) `"^56C_7`

C

3) `"^57C_8`

D

4) `"^49C_7`

Verified by Experts

"^45C8+ sum(k=1)^7 "^(52-k)C7+sum(i=1)^5"^(57-i)C(50-i)=
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