The terms -2, 1+2k, 4+4k... form an arithmetic sequence. If the sum of the first ten terms is a+bk then give the value of a-b.

I got up to finding the common difference (2k+3). I don't know what to do after.

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- Jun 19th 2013, 07:59 PMEspionageArithmetic Series
The terms -2, 1+2k, 4+4k... form an arithmetic sequence. If the sum of the first ten terms is a+bk then give the value of a-b.

I got up to finding the common difference (2k+3). I don't know what to do after. - Jun 19th 2013, 08:56 PMmpx86Re: Arithmetic Series
sum upto 10 terms will be of the form of c+dk

acc. to question S10=a+bk

can u calculate the value of a and b?? - Jun 20th 2013, 06:35 AMibduttRe: Arithmetic Series
firstly the the three ters given are not in ap because [( 4+4k) - ( 1 + 2k)] is not equal to [ ( 1+2k)-(-2)]

- Jun 20th 2013, 06:56 AMPlatoRe: Arithmetic Series
- Jun 23rd 2013, 09:15 PMibduttRe: Arithmetic Series
I regret this post is wrong the given terms are in AP with common difference 2k+3. But with three variables a,b and k we need to have some more information to resolve the solution.

- Jun 23rd 2013, 10:01 PMtopsquarkRe: Arithmetic Series
Okay, let me try this again. Your sum will have a k in it. After all, we are given that the sum is of the form a + bk...

-Dan