SOLUTION: In how many different ways can any 4 of the letters in the following word be arranged? CHAIRS

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Question 284388: In how many different ways can any 4 of the letters in the following word be arranged?
CHAIRS
Answer by brucewill(101) About Me  (Show Source):
You can put this solution on YOUR website!
Issue of COMBINATIONS.
Combinations of 6 things 4 at a time:
6! / 4! 2!
6%2A5%2A4%2A3%2A2%2A1%2F%282%2A1%2A4%2A3%2A2%2A1%29
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3%2A5+=+highlight%2815%29