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Q)

The value of $^{50}C_4 $ $\displaystyle\sum_{r = 1}^{6}$ $^{56-r}C_3$ is :


( A ) $^{56}C_3$
( B ) $^{55}C_3$
( C ) $^{55}C_4$
( D ) $^{56}C_4$

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