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Question

In how many ways can the letters of the word ‘REFRIGERATOR’ be arranged?

A
10!×2!
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B
12!
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C
12!4!
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D
12!4!×2!
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Solution

The correct option is D 12!4!×2!
Number of letters = 12. ‘R’ gets repeated 4 times and E gets repeated twice.
Hence, total number of arrangements =12!4!×2!

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