Question: how do you solve this? How many different 4-letter North American radio station call signs (like CKUL, KNBC, WCBS, and XTHO) can be made if

how do you solve this?

How many different 4-letter North American radio station call signs (like CKUL, KNBC, WCBS, and XTHO) can be made if the first letter must be C or K or W or X and none of the letters may be repeated?

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