A Convener and a Secretary are to be chosen from group of people consisting of 50 people. Explain how many different choices are possible if  i. A will serve only if he is Convener; ii. B and C will serve together or not at all; iii. D and E will not serve together?

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A: Thanks for the question :)And your upvote will be really appreciable ;)

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Counting Principles

In statistics, the counting principle can be said to be the concept in which the quantity of an item is determined. There can be a single item, or a group of items, or items that are related to each other. In every possible set of items, the quantity of the possible item groups or their sorting measures can be determined with counting principles.