**?? - 2013 Q1**

1) The first three terms of a geometric series are

respectively, where p is a constant. Find

(a) the value of the common ratio of the series, (1)

(b) the value of p, (1)

(c) the sum of the first 15 terms of the series, giving your answer to 3 decimal places. (2)

(a) the value of the common ratio of the series, (1)

(b) the value of p, (1)

(c) the sum of the first 15 terms of the series, giving your answer to 3 decimal places. (2)