Barb has FIVE shirts to choose from for a trip to Winnipeg. The color of shirts she has in her closet are, black, green, yellow, Purple and red. She is only able to take TWO shirts with her that are different colors. How many different pairs of shirts are possible that she can take with her?
A.) BG, BY, BP, BR, GY, GP, GR, YP, YR, PR,
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