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This is no arithmetic progression... -.-
You just have to see the trend, it would seem...
the ans is 8
That is is... but how'd you arrive at it?
*That it is*
i just simply added the terms............but i cant find an absolute mathmaticl process for it............
This series is alternating,we know that. Because the numbers ALTERNATE between positives and negatives, what else do we know?
break it into 2 series, -2, -6,-10..... 4,8,..... now both are arithmatic sequences!
Weknow that there is a common "increasing factor"
lolwth @hartnn haha
Or just note that every two terms, you get a sum of 2 -.- So since there would be 4 sets of two consecutive terms, you get 4 times 2 which is 8
of you wanna show a method, i suggest, you break the sequence into 2 sequences, find the sum of first 4 terms of both the sequences,. then add them to get sum of 1st 8 terms
all this but @katiekope is offline :P
So let's spam her thread to the core!!!!! LOL Just kidding :3
HELLO MR. KOHLI.
Kohli... you're here -.-
Nothing, just wanted to refer to you as "Kohli" for a change :3 You could follow suit and call me Jason, though that would take some getting used to XD
:o HELLO JASON!
Hello Ms. Bean
r we all frnds here???????????????????????????
Ms Bean ? are you relative of Mr. Bean ?
yes, shaown, we all are friends on openstudy, infact a family of friends! :)
its will be really great to have frnds like u all......and that was a very sweet rply@hartan