Which of the following is an arithmetic sequence?

-2, 4, -6, 8, ...
-8, -6, -4, -2, ...
2, 4, 8, 16, ...

Question

Which of the following is an arithmetic sequence? 



-2, 4, -6, 8, ...
-8, -6, -4, -2, ...
2, 4, 8, 16, ...

hartnn · Answer

arithmetic sequences have common differences between the terms called 'd'
d= 2nd term - 1st term = 3rd term -2nd term = 4th term - 3rd term =....
and so on

hartnn · Answer

so for which of these series, the difference between the terms is same ?
that will be the arithmetic sequence :)

anonymous · Answer

@lidah

anonymous · Answer

sooo the answer is?

hartnn · Answer

did you try to find it following my instruction ? its pretty easy by the way...

anonymous · Answer

Make some effort to try it urself

anonymous · Answer

is it the first one?

hartnn · Answer

did you try the 2nd one?

anonymous · Answer

Why do u think so it is the 1st one btw

anonymous · Answer

because it goes by 2's

anonymous · Answer

It is the 2nd one because the difference is -2

hartnn · Answer

but we are not checking whether it goes by 2 or not
we are checking the difference between terms

hartnn · Answer

so is 
4- (-2)  equal to -6-4 ??

anonymous · Answer

+2

anonymous · Answer

ooohhh now I get it!

hartnn · Answer

you get it ? can you tell how ?

anonymous · Answer

@lidah

anonymous · Answer

How u get that @lidah

anonymous · Answer

I think i was incorrect  probably

anonymous · Answer

so i deleted my post

anonymous · Answer

I thin so How did u get it the 2nd one by the way??