Question

In a geometric progression the 3rd term is 4 times the 1st term and the sum of the 2nd term and the 4th term is 30. Find the positive common ratio, the first term, and sum of the first 7 terms

Answer 1

r^(3 - 1) = 4 ... r = 2

2nd term ... t + 4 t = 30 ... t = 6

1st term ... 6 / 2 = ?

write the 1st seven terms and sum them

Answer 2

4

Answer 3

3