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
3letter permutations:
= 2x26x26 = 1352
4letter permutations:
= 2x26x26x26 = 35152
total = 36504
If not repetition allowed
3calls = 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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