Below are five number sequences. Which ones are geometric sequences?

Check all that apply.

A. 1/4, 1/2, 1, 2, 4, ...
B. 2, 3, 5, 9, 17, ...
C. 1/3, 2/9, 3/27, 4/81, 5/343, ...
D. 3, -15, -33, -51, -69, ...
E. 2, -14, 98, -686, 4802, ...

Question

Below are five number sequences. Which ones are geometric sequences?

Check all that apply.

 		A.	1/4, 1/2, 1, 2, 4, ...
 		B.	2, 3, 5, 9, 17, ...
 		C.	1/3, 2/9, 3/27, 4/81, 5/343, ...
 		D.	3, -15, -33, -51, -69, ...
 		E.	2, -14, 98, -686, 4802, ...

anonymous · Answer

@Godlovesme  @campbell_st

campbell_st · Answer

look for the one that using the idea of multiplying the 1st term to get the 2nd... and then check using the 2nd and 3rd... 

geometric means you and multiplying

arhtimetic means you are adding

anonymous · Answer

Would it be ACDE?

anonymous · Answer

@campbell_st

campbell_st · Answer

simply a case of which one looks like terms are being multiplied

anonymous · Answer

ok maybe not D but for sure C and E