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24 April, 09:13

How many 2-letter combinations can be made from the letters A, B, C, and D? a. 4 c. 8 b. 6 d. 12

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  1. 24 April, 11:12
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    Two letter combination means you have 2 spots to fill in

    spot 1 can be filled 4 ways (A, B, C or D)

    spot 2 can be field 3 ways with the remaining 3 letters that were not picked for spot 1 so

    4·3=12 ways

    correct answer is d. 12
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