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Grade 12th passAlgebra

A and b stand in a ring with 9 persons.if the arrangement of 11 persons is at random then the probability that there are exactly 4 persons between a and b is

Profile image of Ak
8 Years agoGrade 12th pass
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1 Answer

Profile image of Arun
8 Years ago
Dear student
 
Fix the position of A, then B can be sit in 10 positions, so total possible outcome = 10
Now, exactly 4 persons are sitting between them. This can be done in two ways as shown in figure, so favourable outcomes = 2
So, probability = 2/10 = 1/5
 
 
Regards
Arun (askIITians forum expert)

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