Free GMAT Practice Question

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ID: GMAT-QR-PS-028
Section: GMAT Quantitative Reasoning - Problem Solving (PS)
Topic: Combinatorics
Difficulty level: Easy

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How many 5-letter codes can be formed out of letters c, k, m, t, & u such that no code starts with 'muc _ _' ? Repetition of letters is allowed.
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