Question

help

Answer 1

A sumatory or a "sigma" is pretty much "the sum of all".
Since these ones are defined and very small, we can just plug the values of "i" in and obtain the result.
Let's take for example, the first one:
\[\sum_{i=2}^{5} (i+5)=(2+5)+(3+5)+(4+5)+(5+5)\]
\[\sum_{i=2}^{5}(i+5)=7+8+9+10=34\]
\[\sum_{i=2}^{5}(i+5)=34\]
Now, all you have to do is apply the same process to each one, and see wich one is not equal the others.

Answer 2

Let me see...

Answer 3

have you applied what I told you to each of them?

Answer 4

oh wow... thought I had already answered. but yes, if C is the diferent one, then "C" is the answer.

Answer 5

yes