Posted by **jeffrey** on Sunday, April 19, 2009 at 11:37pm.

I need help!!!

3/2,1/2, 1/6,1/8,...

I need to determine if this sequence is arithmetic, geometric, or neither, then I need to find the ninth term

- algebra -
**Reiny**, Monday, April 20, 2009 at 8:10am
is (1/2) - (3/2) = (1/6)-(1/2)

if yes, then arithmetic, but it isn't.

is (1/2) ÷ (3/2) = (1/6)÷(1/2)

if yes, then geometric

1/2 ÷ 3/2 = 1/3

(1/6)÷(1/2) = 1/3

but

(1/8) ÷ (1/6) = .75 (no good)

so the sequence is neither arithmetic nor geometric.

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