If \( { }^{20} C_{r}={ }^{20} C_{r}+4 \), then \( { }^{r} C_{3} \) is equal to (A) 54 (B) 56 (C)...

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If \( { }^{20} C_{r}={ }^{20} C_{r}+4 \), then \( { }^{r} C_{3} \) is equal to
(A) 54
(B) 56
(C) 58
(D) none of these
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