Thread: Geometric sequences

I'm really troubled with this question. Can anybody help?
"If we have a geometric sequence with initial term a and ratio r, then is the formula for the ninth term of the corresponding geometric series is given by
s_n = a 1-r/1-r^n ?"

Originally Posted by 14041471

I'm really troubled with this question. Can anybody help?
"If we have a geometric sequence with initial term a and ratio r, then is the formula for the ninth term of the corresponding geometric series is given by
s_n = a 1-r/1-r^n ?"

The geometric sequence formula is .

You should have a constant value of the initial term and the ratio thus to find the ninth term, you will set .