Question

Are the following arithmetic, geometric, or neither? If they are arithmetic, state the value of

d. If they are geometric, state the value of r.
a. 6, 12, 18, 24,....
b. 6, 11, 17, ....
c. 160, 80, 40, 20, ....

Answer 1

a)

6, 12, 18, 24

All going from 6 to 6, so Arithmetic.

b)

6, 11, 17

First it sums 5 and then 6, so neither geometric nor arithmetic

c)

160, 80, 40, 20

All going by half in each term so r = 1/2