Mathematics, 18.07.2019 05:00 IsoSaysHi

The third term of an arithmetical progression is 7, and the seventh term is 2 more than 3 times the third term. find the first term, the common difference and the sum of the first 20 terms.

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The third term of an arithmetical progression is 7, and the seventh term is 2 more than 3 times the...