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How many positive integers less than 1,000,000 have ex- actly one digit equal to 9 and have a sum of digits equal to 13?
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How many positive integers less than 1,000,000 have ex- actly one digit equal to 9 and have a sum of digits equal to 13?

User Mgd
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In one million there are 420 positive numbers with the sum of their digits equal to 13 and with one digit equal to 9
User Sahan
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