${ }^{n} C_{r}+{ }^{n} \mathrm{C}_{r-1}$ -এর সমান কোনটি?

${ }^{n+1} C_{r}$

${ }^{n} \mathrm{C}_{\mathrm{r}+1}$

${ }^{n+1} C_{r-1}$

$\frac{(n+1) !}{r !}$