SOLUTION: Find the number of permutations of the first 8 letters of the alphabet taking 2 letters at a time. 56 336 6720 20160 Thanks so much

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Question 1069296: Find the number of permutations of the first 8 letters of the alphabet taking 2 letters at a time.
56
336
6720
20160
Thanks so much
Found 2 solutions by KMST, ikleyn:
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
What they mean is the number of 2-character sequences
made with two different characters,
chosen from a set of 8 different characters.
You have 8 choices for the first character.
For each of those 8 choices,
you have 7 left to choose from for the second character.
The possibilities multiply , don't they?
So, you have 7%2A8=highlight%2842%29 possible sequences.

Answer by ikleyn(52790) About Me  (Show Source):