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tnet

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  1. The arithmetic sequence a, a+d, a+2d, a+3d, ...,a+(n-1)d has the following properties. When the first, third, fifth, and so on are added to and including the last term, the sum is 320 When the first, fourth, seventh and so on, terms are added, up to and including the last term, the sum is 224 What is the sum of the whole sequence?
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