Calculate the total number of different permutations of all letters A, B, C, D, E, F when a) there are no restrictions, b) the letters A and B are to be adjacent to one another, c) the first letter is A, B or C and the last letter is D, E or F.
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Step 1: Calculate the total number of different permutations of all letters A, B, C, D, E, F when there are no restrictions. Show more…
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