# Given an arithmetic progression with a20 =70 and s20=640 find the first term and the common difference ?

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- Find the sum of the first n terms of the series : #1 + 2(1+1/n) + 3(1+1/n)^2 + 4(1+1/n)^3.......#?
- Solving using geometric Series, #sqrt(2)/2, 1/2, 2^(3/2)/8,1/4#?
- Find the nth term An of the geometric sequence described below where r is the common ratio. Kind of confused on what to do?
- How do you find the sum of each arithmetic series #50+44+38+...+8#?
- How do you find the sum of the first 20 terms of the sequence 1, -3, 9,...?

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