Arithmetic/Geometric Series

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Find the sum of the geometric series: a1 = 3, r = -3, n = 10

Find the sum of the arithmetic series: 11, 13, 15, 17, 19

Find the sum of the arithmetic series: a1 = 14, an = 98, n = 15

Find the sum of the arithmetic series: 8, 13, 18, 23, 28

Find the sum of the geometric series: -2 - 12 - 72 - 432..., n = 8

Find the sum of the geometric series: -2 + 4 - 8 + 16..., n = 7

Find the sum of the geometric series: a1 = -4, r = 5, n = 8

Find the sum of the arithmetic series: a1 = 8, an = 73, n = 14