120
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4! Four factorial. 4 * 3 * 2 = 24 permutations ------------------------
You have six different letters. They can be arranged in 6 x 5 x 4 x 3 x 2 = 720 different ways.
5*4*3*2*1 = 120
TIDE would be 4! or 4*3*2*1 or 24.
There are 120 permutations and 5 combinations.