Question

What is the sum of a 6–term geometric series if the first term is 22 and the last term is 369,754?

Answer 1

22+22*7+22*7^2+22*7^3+22*7^4+22*7^5 = 431376

Answer 2

very nice. where did the 7 come from?

Answer 3

you know the 6th term is 369754.

so 22x^5=369754

x^5 = 16807

x = 16807^(1/5)

x = 7