Question

How many different 4​-letter radio station call letters can be made a.  If the first letter...

How many different 4​-letter radio station call letters can be made

a.  If the first letter must be K, Z, or P and no letter may be repeated

b.  if repeats are allowed​ (but the first letter is K, Z, or P​)?

c.  How many of the 4​-letter radio station call letters​ (starting with K, Z, or P) have no repeats and end with the letter J​?

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