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posted by Danny on Friday, March 29, 2013 at 5:10pm.

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?

3-letter permutations: = 2x26x26 = 1352 4-letter permutations: = 2x26x26x26 = 35152 total = 36504 If not repetition allowed 3-calls = 2x25x24 = 4 letters = 2x25x24x23 = total = ..

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

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