Summation Notation
Key Questions

Answer:
#sum_(n=1)^ooa_n=a_1+a_2+a_3+...# #sum_(n=0)^10n^2# Explanation:
The summation notation is mostly used to represents series or to express a series in a short form.
For example : if I want to write the series :
#1+4+9+16+25#
in summation notation I would simply write:#sum_(n=1)^5n^2# 
Answer:
It depends on the brand of calculator you have.
Explanation:
The only calculator series I'm familiar with is the Casio fx series, so I'll give an answer based on them.
As far as I'm aware, Casio fx 991ES and any calculator beyond that can perform summations using sigma notation.

Answer:
Summation is a shorthand way for writing long additions.
Explanation:
Say you want to add all numbers up to and including 50.
Then you could write out:
#1+2+3+......+49+50#
(If you really write this out in full, it'll be a long line of numbers).With this notation you would write:
#sum_(k=1)^50 k#
Meaning: sum up all the numbers#k# from#1to50#
The#Sigma# (sigma)sign is the Greek letter for#S# (sum).Another example:
If you want to add all the squares from#1to10# you simply write:
#sum_(k=1)^10 k^2#
You see that this#Sigma# thing is a very versatile tool.