In an arithmetic series the 20th term is 14 and the 40th term is -6. Find the 10th term.

How do I do this?

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- October 10th 2009, 01:17 PMViralSimple Arithmetic Series Question
In an arithmetic series the 20th term is 14 and the 40th term is -6. Find the 10th term.

How do I do this? - October 10th 2009, 01:21 PMe^(i*pi)
- October 10th 2009, 01:37 PMViral
Yeah, I've done that, and got .

However, when I do:

But the answer is supposed to be 24 >< . - October 10th 2009, 01:56 PMe^(i*pi)
- October 10th 2009, 02:05 PMViral
I'm now told: The first three terms of an arithmetic series are 5x, 20 and 3x. Find the values of x and hence the values of the three terms.

What are the steps to do this? - October 10th 2009, 02:09 PMe^(i*pi)
- October 10th 2009, 02:26 PMViral
Ok, this one is worded really weirdly >< . For this can you just tell me what it's asking, and I'll go from there.

For which values of x would the expression form the first three terms of an arithmetic series. - October 11th 2009, 02:48 AMe^(i*pi)