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The terms of an arithmetic sequence add ...

The terms of an arithmetic sequence add to 715. The first term of the sequence is increased by 1, the second term is increased by 3. the third term is increased by 5, and in general, the rth term is increased by the rth odd positive integer. The terms of the new sequence add to 836. The sum of the first, last, and middle terms of the original sequence is `(i) 190 (ii) 96 (iii)200 (iv) 195`

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