arithmetic

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given that the first term of an Ap is 7 and its 10th term is twice the second term. calculate the sum of the 28 term.

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    given that the first term of an Ap is 7 and its 10th term is twice the second term.calculate the 19th term, the sum of the 28 term and the common different between the 9th and the 6th term..

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