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?

- Math -
**Reiny**, Friday, March 29, 2013 at 6:21pm
3-letter permutations:

= 2x26x26 = 1352

4-letter permutations:

= 2x26x26x26 = 35152

total = 36504

If not repetition allowed

3-calls = 2x25x24 =

4 letters = 2x25x24x23 =

total = ..

- Math -
**30**, Friday, May 15, 2015 at 3:41am
Fille in the blank

1,3,5,7,9,11,13,15

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