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
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
3 answers
4
3