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Find the sum of the arithmetic 1,4,7,10,13,16...1000 Every third term of the above progression is removed, i.e 7,16 etc Find the sum of the remaining terms
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Use the formula to find the sum of the series: 1,4,7,10,13,16...1000 Every third term will itself form another arithmetic series: 7, 16, 25, 34, ... etc. Find the sum of the second series and subtract it from the first sum.
nice logic @ranga
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