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Mathematics, 13.12.2019 00:31 yyy77uh

How many positive integers less than 100 have at least one digit that is a 9? (let t be the set of positive integers less than 100 with a 9 in the ten's place. let o be the set of positive integers less than 100 with a 9 in the one's place. now determine t ∪ o).

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How many positive integers less than 100 have at least one digit that is a 9? (let t be the set of...
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