Using only the digits 7, 8 and 9, how many positive seven-digit integers can be made that are palindromes?
Question:
Using only the digits 7, 8 and 9, how many positive seven-digit integers can be made that are palindromes?
Answer:
Let's think step by step.

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Using only the digits 7, 8 and 9, how many positive seven-digit integers can be made that are palindromes?
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