How do you find the sum of the finite geometric sequence of #Sigma 5(3/5)^n# from n=0 to 40?
1 Answer
Oct 13, 2017
12.5 (1.d.p)
Explanation:
First calculate the first three terms:
Find the common ratio:
The sum of a geometric sequence is:
Where a is the first term, n is the nth term and r is the common ratio.
So: