Math

Radio stations use three or four letters for their call letters(name). The first letter must be a W or K. How many different call letters are possible if repeated letters are allowed? And not allowed?

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  1. 3-letter permutations:
    = 2x26x26 = 1352
    4-letter permutations:
    = 2x26x26x26 = 35152
    total = 36504

    If not repetition allowed
    3-calls = 2x25x24 =
    4 letters = 2x25x24x23 =
    total = ..

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  2. Fille in the blank
    1,3,5,7,9,11,13,15

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