4. i) Determine whether each series is arithmetic. ii) If the series is arithmetic, calculate the sum of the first 25 terms. a) -5 + 1+ 7 + 13 + ... b) 2 + 10 + 50 + 250 + .. c) 1+1 + 2 + 3 + ... d) 18 + 22 + 26 + 30 + ... e) 31 + 22 + 13 + 4 + ... f) 1- 3 + 5 – 7 + ...

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