HOW MANY DIFFERENT 4 LETTER CALL LETTERS ARE POSSIBLE FOR A RADIO STATION IF: a) THE FIRST LETTER MUST BE K OR W AND REPEATS ARE

Question

HOW MANY DIFFERENT 4 LETTER CALL LETTERS ARE POSSIBLE FOR A RADIO STATION IF:
a) THE FIRST LETTER MUST BE K OR W AND REPEATS ARE ALLOWED?
b)THE FIRST LETTER MUST BE K OR W, IT MUST END IN R, AND NO REPEATS ARE ALLOWED?

Kunduz · Accepted Answer

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