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Q: In the below word how many words are there in which R and W are at the end positions? RAINBOW

  • 1
    120
  • 2
    180
  • 3
    210
  • 4
    240
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Answer : 4. "240"
Explanation :

Answer: D) 240 Explanation: When R and W are the first and last letters of all the words then we can arrange them in 5!ways. Similarly When W and R are the first and last letters of the words then the remaining letters can be arrange in 5! ways. Thus the total number of permutations = 2 x 5!  = 2 x 120 = 240

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