Geometric Series

Match it! Select the correct answer from the pull down...Good luck!

3 - 6 + 12 - 24..., n = 6

a1 = -1, r = 3, n = 8

a1 = 2, r = 5, n = 9

1 + 6 + 36 + 216..., n = 6

2 + 12 + 72 + 432..., n = 8

a1 = 1, r = 5, n = 7

a1 = 1, r = -2, n = 8

4 + 12 + 36 + 108..., n = 8