Mathematics

Problem

The sum of the first three terms of a G.P. is

S

and their product is 27. Then all such

S

lie in (a)

(-\infty, -9] \cup [3, \infty)

(b)

[-3, \infty)

(c)

(-\infty, -3] \cup [9, \infty)

(d)

(-\infty, 9]