Question

Identify a1, r, and n for the sum of the geometric series. 1 2 + 3 8 + 9 32 + 27 128 + 81 512

Answer 1

then to find the sum on edge Find the sum.

1(269/512)

Explanation:

Answer 2

a1 = 1/2

r = 3/4

n = 5

Explanation:

The given geometric series is:

`(1)/(2)+(3)/(8)+(9)/(32)+(27)/(128)+(81)/(512)`

a1 represents the first term of the series. From the above series we can see that the first term is 1/2

r is the common ratio of a geometric series. It can be calculated by dividing any term of the geometric series with its previous terms. For the given series r will be:

`r=((3)/(8) )/((1)/(2) )=(3)/(4)`

n represents the number of terms in the series. From the above series we can count the number of terms to be 5.