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find the number of ways in which candidates A1,A2,A3,A4,....,A10 CAN BE RANKED IF A1 and A2 are next to each other

find the number of ways in which candidates A1,A2,A3,A4,....,A10 CAN BE RANKED IF


<1>A1 and A2 are next to each other

Grade:11

1 Answers

Badiuddin askIITians.ismu Expert
147 Points
11 years ago

Dear abhay

A1,A2,A3,A4,....,A10 total 10 candidates

but A1 and A2 always be together

so A3,A4,....,A10 total 8candidates   + (A1A2)

so these candidate can be ranked in   9! ways  

but A1 and A2 can interchange their rank in 2! ways

so total ways  = 9! *2!

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