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You need to add all the numbers from 10 to 99. You can do that quickly with the formula for an arithmetic series.

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10y ago

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Alternately, as 11+99=110 and all pairs of such numbers (11+98 to 55+56) all equal 110 (technically 10+n +99-n = 110 where n=1 to 45) the sum of all 45 of these sets must be 45x110 or 49,500

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10y ago
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4,905

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9y ago
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Q: What is the sum of all the two digit numbers?
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