जॉइन Examsbookउत्तर : 3. "5040"
In how many ways can letter of the word RAILINGS arrange so that R and S always come together?5
प्र: In how many ways can letter of the word RAILINGS arrange so that R and S always come together?
- 11260false
- 22520false
- 35040true
- 41080false
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उत्तर : 3. "5040"
व्याख्या :
Answer: C) 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.