Question

Find the common ratio for the following sequence.

1/2, -1/4, 1/8, -1/16, ...

Answer 1

if you have a sequence
a,b,c,...
find the ratio of b/a (or c/b , etc)

Answer 2

to find the common ratio, divide the 2nd number by the first number..
(-1/4) / (1/2) =
-1/4 * 2/1 =
-2/4 which reduces to -1/2

and as you can see..
1/2 * -1/2 = -1/4
-1/4 * -1/2 = 1/8
1/8 * -1/2 = - 1/16
so if you multiply -1/2 by the number, you will get the next number.
So -1/2 is the common ratio

Answer 3

More explicitly, determine the multiplier which takes you from your first term (1/2) to your second (-1/4), from (-1/4) to (1/8). If you can find such a number / multiplier, it's your "common ratio."

Answer 4

Only 99's commented.

Answer 5

haha