The sum of the first 50 terms is 25 and the sum of its next 5 terms is -75.Finr the 10 term of
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Hence the sum of the second 5 terms = S10-S5 = 20+45d -10–10d = 10+35d. So the first 10 terms are 2, -4, -10, -16, -22, -28, -34, -40, 46, -52. The sum of the first 5 terms = -50. The sum of the next 5 terms = -200.
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