CAT Exam Model Paper 6 with solutions for free online practice

Question : 6 of 60

Marks: +1, -0

In how many ways can 6 letters A, B, C, D, E and F be arranged in a row such that D is always somewhere between A and B?

Validate

Solution:

Total number of arrangements are 6! = 720.
A, B, D can be arranged in G ways out of which D would be somewhere between A and B in exactly two cases.
Hence the answer is

720 × { 2 } /{ 6 } = { 720 }/ { 3 } = 240

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