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The fourth and seventh terms of an arithmetic sequence are 19 and 28, respectively. i. Find the first term and the common difference of

The fourth and seventh terms of an arithmetic sequence are 19 and 28, respectively. i. Find the first term and the common difference of the sequence. ii. What is the first value of n for which the nth term is greater than 300? iii. If the sum of the first n terms is 578, find the value of n.

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