How many of the 343 smallest positive integers written in base 7 use 4 or 5 (or both) as a digit?
Question:
How many of the 343 smallest positive integers written in base 7 use 4 or 5 (or both) as a digit?
Answer:
Let's think step by step.

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How many of the 343 smallest positive integers written in base 7 use 4 or 5 (or both) as a digit?
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