﻿ Ten persons, amongst whom are A, B and C are to speak at function. Find number of ways in which it can be done if A wants to speak before B, andB wants to speak before C? : Kaysons Education

Ten Persons, Amongst Whom Are A, B and C are to Speak At Function. Find Number Of Ways In Which It Can Be Done If A wants To Speak Before B, AndB wants To Speak Before C?

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Question

Solution

Correct option is

We will follow the steps as shown:

Step I : Select three places for A, B and C to speak in 10C3 ways.

Step II : Arrange A, B, C on selected seats in 1 way.

Step III : Arrange remaining 7 persons in 7! Ways.

Total no. of ways = (10C3 × 1) × 7!

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