Mathematics, 12.12.2020 16:20, 10crank78

HEL How many different 5-letter radio station call letters can be made if
a) The first letter must be H or P and no letter may be repeated?
b) Repeats are allowed, but the first letter is H or P
c) The first letter is H or P, there are no repeats, and the last letter is B ?
ILL GIVE BRAINLIEST if u can get it right and show work

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HEL How many different 5-letter radio station call letters can be made if
a) The first letter...