find formula for the sum of n terms.then find limit as n-infiniti for...

Question

find formula for the sum of n terms.then find limit as n->infiniti for...

anonymous · Answer

$$\lim_{n \rightarrow \infty} \sum_{i=1}^{n} (2i/n)(2/n)$$

anonymous · Answer

2nd 2 last que for the day!:)

anonymous · Answer

this one's similar to the other question you had 

simplify the sigma to something that's easier to apply the sumation formulas. 
so 1st simplify it to ∑4i/n^2. you want to get ∑i in the end, so take out the 4/n^2 and put that in front of the ∑ to get (4/n^2)∑i. 
the formula for ∑i was (n^2+n)/2 so from there on, you can do simple algebra to get the answer :)

anonymous · Answer

ohhh..got it! thank u soo much again!:)

anonymous · Answer

you're welcome!