SOLUTION: How many subsets of 2 elements does the set {!, @, #, $, %} have?

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Question 454381: How many subsets of 2 elements does the set {!, @, #, $, %} have?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
5 items taken 2 at a time
5*4=20