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 D12!4!×2! Number of letters = 12. ‘R’ gets repeated 4 times and E gets repeated twice. Hence, total number of arrangements =12!4!×2!