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abhay kumar Grade: 11
        

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

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

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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7 years ago
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