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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.

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