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How many different arrangements of 55 letters can be formed if the first letter must be w or k​ (repeats of letters are​ allowed)?
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How many different arrangements of 55 letters can be formed if the first letter must be w or k​ (repeats of letters are​ allowed)?

User Jobinbasani
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If the remaining 4 letters can be anything, you have 2*26^4 = 913,952 possible 5-letter ham radio call signs.
User PeteShack
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