Question

What is the formula for the following geometric sequence? 3, 12, 48, 192, ...

Answer 1

you always multiply a number by 4 so the nswer is 4x where x is greater than 0

Answer 2

an = 4 · 3n - 1


an = 3 · (-4)n - 1


an = 3 · 4n - 1


an = (1/4) · 3n - 1

hmmmmmmmmmmmmmmmmmmmmmmm

Answer 3

this looks strange let me think

Answer 4

mmmm

Answer 5

okay thank you

Answer 6

i not good at secuenses

Answer 7

sorru

Answer 8

the formula for a geometric series is

an = a1*r^(n-1)

where a1 is the first term in the sequence, and r = common ratio

do you know how to find r?

Answer 9

how

Answer 10

r is simply the ratio between the different numbers in the sequence.

3, 12, 48, 192....

You can find r by dividing farthest right number by the one before it

192/48 = 4

48/12 = 4

12/3 = 4

so r = 4

Answer 11

hmmmm. I understand somewhat. lol thank you though

Answer 12

all I did was divide the right term by the one to the left of it starting from 192

Each time, the answer was 4, so that is what r is.

Answer 13

Got it!

Answer 14

cool.

Answer 15

thanks!

Answer 16

any time.