The sum of the first three terms of a GP is 13/12, and their product is -1. Find the common ratio and terms
a) Common ratio = -1/2, Terms = 1, -2, 4
b) Common ratio = -1/3, Terms = 1, -3, 9
c) Common ratio = -2/3, Terms = 1, -2, 3
d) Common ratio = -3/2, Terms = 1, -3, 9
