SOLUTION: How many unique ways are there to arrange the letters in the word ERROR? Deals with permutations and combinations.
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Question 1188027: How many unique ways are there to arrange the letters in the word ERROR? Deals with permutations and combinations. Answer by ikleyn(52781) (Show Source):
As this problem is worded, printed and posted, it should be thrown into the closest GARBAGE BIN,
since it is mathematically incorrect.
The only correct, typical and reasonable formulation is as follows:
How many DISTINGUISHABLE ways are there to arrange the letters in the word ERROR?
The solution and the answer are below.
There are = = 5*4 = 20 distinguishable ways.
We use 5! in the numerator, because there are 5 letters in the word,
and we use 3! in the denominator, because there are 3 identical letters of "R".
