the word great has 5 different letters..
so at 1st place 5 different letters can exist, at 2nd, left 4 letters can exist, at 3rd.. 3 left letters, at 4th, 2 left letters and 5th ..1 left letter..
so for permutation... we do possible options at 1st place X possible options at 2nd place ... and so on till X possible options at 5th place.
= 5 X 4 X 3 X 2 X 1
=20 X 6
= 120
so the word great has 120 possible permutations.
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120 if A is treated the same as a. 360 if A is considered different to a.
There are 420.
There are 19,958,400.
There are 12.
There are 30 of them.