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| 1. |
Let A = { 1, 2, 3, …….n} , if a_(i) is the minimum element of the set A, (where A , denotes the subset of A containingexactly three elements) and X denotes the set of A_(i)'s , then evalute sum_(A_(i)inX) a |
| Answer» SOLUTION :`""^(n+1)C_(4)` | |