Help with five sequences and series problems for maths

[ertagon2]

Can someone help me with these. These are the last 5 questions that I have to do and if I get them right I pass maths.
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[topsquark]

Can someone help me with these. These are the last 5 questions that I have to do and if I get them right I pass maths.

Do you mean to say you can't do 2 and 4?? What are the possible values for n? Do you know what an nth partial sum is?

Hint: 3 is a geometric ratio. What is the sum for this?

-Dan

 

[HOI]

If, as you appear to be saying, you know nothing at all about these problems, why should you pass maths?

The second problem asks you to find [math]\sum_{n=0}^4 (n-1)^2[/math]. Do you know what that means? If you do then this is a simple arithmetic problem. If you do not then you should Not pass maths!