Question

i know the formula and everything but i dont actually know how to set up this problem: Use the formula to evaluate the series 3+6+12+24+48+96... i just need help setting it up

Answer 1

Do you know the formula of a geometric series?

Answer 2

\( \color{Black}{\Rightarrow \Large S = a({1 - r^n \over 1 - r}) }\)

Answer 3

yep use that! the given series is a gp with r=2

Answer 4

yes i do i just dont know where to plug in the numbers

Answer 5

\(a\) is the first term.
\(r\) is the ratio(common ratio).
\(n\) is the number of terms.

Answer 6

The first term here is....?

Answer 7

......

Answer 8

ok well how do i get the ratio

Answer 9

b/a=r

Answer 10

The ratio is the division of \(a_n\) and \(a_{n - 1}\)

Answer 11

2nd term/first term= ratio

Answer 12

Aravnd already told you the ratio.

Answer 13

yep

Answer 14

Aravind*

Answer 15

ok thanks guys again!!

Answer 16

yw jim :D

Answer 17

they mean that find the sum