JEE Main & Advanced
Mathematics
Permutations and Combinations
Question Bank
Definition of combinations, Conditional combinations, Division into groups, Derangements
question_answer
If \[^{8}{{C}_{r}}{{=}^{8}}{{C}_{r+2}}\], then the value of \[^{r}{{C}_{2}}\] is [MP PET 1984; RPET 1987]