Mathematics - Permutation & Combination Question with Solution | TestHub
MathematicsPermutation & CombinationArrangement under ConstraintMedium2 minQB
MathematicsMediumsingle choice
Passage / Comprehension
There are ‘n’ intermediate stations on a railway line from one terminus to another. In how many ways can the train stop at 3 of these intermediate stations, if
Atleast two of the stations are consecutive
Options:
Answer:
C
Solution:
(n – 2) ways (n – 1) ways - (n – 2) = ( n – 2)2
Stream:JEESubject:MathematicsTopic:Permutation & CombinationSubtopic:Arrangement under Constraint
⏱ 2mℹ️ Source: QB
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