# MadeEasy Full Length Test 2019: Combinatory - Generating Functions [closed]

1 vote
155 views

Let

We define Then ar is equal to.

1. $\binom{r}{2019}$
1. $\binom{r}{r + 2018}$
1. $\binom{r}{2019 – r}$
1. $\binom{r}{r – 2018}$

Can anyone tell me if this type of question is in Gate 2019 syllabus or not because I have never seen such question in previous year question? If yes, then when can I learn this stuff from.  Because I am unable to understand the whole solution.

closed

## Related questions

1
508 views
Let $M(x) = \frac{x^{2018}}{(1-x)^{2019}}$ we define $M(x) = \sum_{r=0}^{\infty}a_{r}x^{r}$ ,then $a_{r}$ is equal to- $A)\binom{r}{2019}$ $B)\binom{r}{r+2018}$ $C)\binom{r}{2019-r}$ $D)\binom{r}{r-2018}$