In how many ways can the letters of the word “PROBLEM” be rearranged to make 7 letter words such that
none of the letters repeat?
E. None of these
The answer is 7P7 = 7!. There may be a typo in option A.
There are 7 letters and none is common, so 'n' objects taken all at a time can be arranged (Permutation) in 7P7 ways = 7!.
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