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You can list them out and add them up: 3 + 13 + ... + 193 {20 items}, or you can recognize the sequence: (n = 0..19) of (n*10 + 3), the sum would be 20*3 + 10*Sum[(n=0..19) of just n], which is 20*3 + 10*[190] = 60 + 1900 = 1960. If you add up the column of numbers, you get the same result.

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โˆ™ 2010-11-15 15:14:35
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Q: What is the sum of the series of the first 20 positive integers ending in 3?
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