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In how many ways can letter of the word RAILINGS arrange so that R and S always come together?

Correct Answer: 5040

Explanation:

The number of ways in which the letters of the word RAILINGS can be arranged such that R & S always come together is


 


Count R & S as only 1 space or letter so that RS or SR can be arranged => 7! x 2!


 


But in the word RAILINGS, I repeated for 2 times => 7! x 2!/2! = 7! ways = 5040 ways.


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