in an ap find the sum of 3a, a, -a to a term​

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in an ap find the sum of 3a, a, -a to a term​

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Adalynn 1 month 2021-08-18T20:17:05+00:00 1 Answer 0 views 0

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    2021-08-18T20:18:44+00:00

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    I can’t understand this question

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18:9+8+9*3-7:3-1*13 = ? ( )