Which of the following sequences of numbers are arithmetic sequences?

Check all that apply.

A. 1, 2, 3, 1, 2, 3, …
B. 60, 6, 0.6, 0.06, 0.006, 0.0006, …
C. 1, 3, 9, 27, 81, 243, 729, …
D. 10, 5, 0, -5, -10, -15, …
E. 5, 7, 9, 11, 13, 15, …

Question

Which of the following sequences of numbers are arithmetic sequences? 

Check all that apply.

 		A.	1, 2, 3, 1, 2, 3, …
 		B.	60, 6, 0.6, 0.06, 0.006, 0.0006, …
 		C.	1, 3, 9, 27, 81, 243, 729, …
 		D.	10, 5, 0, -5, -10, -15, …
 		E.	5, 7, 9, 11, 13, 15, …

cwrw238 · Answer

an arithmetic series increases (or decreases ) by a constant value

anonymous · Answer

ok so is it E and D i think C too but i dont know

cwrw238 · Answer

E is arithmetic because each term is increased by 2 to get the next

there is one more - can you find it?

anonymous · Answer

E

anonymous · Answer

D

cwrw238 · Answer

D is correct - a decrease of 5
or you can say that common difference is -5

cwrw238 · Answer

C is not arithmetic  - each term is formed from the previous by multiplying by 3

anonymous · Answer

oh ok

cwrw238 · Answer

C is a geometric series

anonymous · Answer

thx