Determine the Partial Sum of an Arithmetic Series Given in Sigma Notation

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Thank you soooo much for saying d is 3, I couldn't find that anywhere!

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4 different tries to complete a sum like this, 4 different videos and this is the only one which led me to the right answer. Thank you so much

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tnx and we can chainge of indicis...1 to 40 and (2+3(n+20))

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