Question

find the value of a1 for this geometric series

Answer 1

Geometric Series\[\large \sum_{n=1}^{\infty}a_{1}r^{n-1}\]

Answer 2

Now match up \[\large \sum_{n=1}^{5}\frac29(3)^{n-1}\] to the formula of a geometric series i just posted,you will find your a1.

Answer 3

okay. isnt it 2/9 tho?

Answer 4

mmhmm:) Good job.