Question

If $\,^{16}C_{r} =\, ^{16}C_{r+1}$, then the value of $\, ^{r}P_{r-3}$ is

• A. $31$
• B. $120$
• C. $210$
• D. $840$

Answer 1

Answer: (D)

$840$

Answer 2

$\,^{16}C_{r} = ^{16}C_{r+1}$