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3. Using an appropriate formula for Sn, calculate the sum of: -64 -57 -50 -43 -...+ 90+97 (A /4) 4. The sum of n terms

3. Using an appropriate formula for Sn, calculate the sum of: -64 -57 -50 -43 -...+ 90+97 (A /4) 4. The sum of n terms of an Arithmetic sequence is given by 2n + 3 n2 Find the sequence (first 3 terms) and hence the 15th term

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