﻿ Let S = {1, 2, 3, ... n}. if X denote the set of all subsets of S containing exactly two elements, then the value of    : Kaysons Education

Let S = {1, 2, 3, ... n}. If X Denote The Set Of All Subsets Of S Containing Exactly Two Elements, Then The Value Of

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Question

Solution

Correct option is

There are exactly (n – 1) subsets of S containing to elements having 1 as least element; exactly (n – 2) subsets of S having 2 as least element and so on. Thus

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