Let `S={1,2,3, . . .,n}`. If X denotes the set of all subsets of S containing exactly two
Channel: Doubtnut
Date: 2020-05-24

Let `S={1,2,3, . . .,n}`. If X denotes the set of all subsets of S containing exactly two elements, then the value of `sum_(A in X) ` (min. A) is given by