6. Determine the sum of the first 20 terms of the arithmetic series in which a) the first term is 8 and the common difference is 5 b) 1 = 31 and t20 = 109 c) 1 = 53 and z = 37 d) the 4th term is 18 and the terms increase by 17 e) the 15th term is 107 and the terms decrease by 3 f) the 7th term is 43 and the 13th term is 109

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