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h v Grade: 12
        

dear sir/madam, i am having doubt in the following question for some time now and iit is on 11th ,so please help...!


"In how many ways 10 speakers can speak at a function such that A speaks before B and B speaks before C."


the answer is 10!/3!


i cannot understand how.Please help.

7 years ago

Answers : (2)

Priyansh Goel
21 Points
										

Follow these steps:


1.  Select A,B,C from 10 people in 10C3 ways.


2.   Arrange A,B,C in only 1 way. AS Ais before B and Bis before C.


3.   All others remaining can be permuted in 7! ways.


 


So, total : 10C3 *1*7!.


Solve this to get ur answer.


 

7 years ago
h v
33 Points
										

thanks for the answer

6 years ago
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