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Q)

$^{50}C_4+\sum\limits^{6}_{r=1}$$ ^{56-r}C_3=?$

$\begin{array}{1 1}(A) ^{55}C_3 \\(B) ^{55}C_4 \\ (C) ^{56}C_3 \\ (D) ^{56}C_4 \end{array}$

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