I'm assuming you are referring to Excel. There are a few ways to add A1 and B1.
First you could use '=SUM(A1+B1)'
You could also use '=SUM(A1:B1)' which adds the values of all the cells between A1 and B1, but since they are next to each other, this would work.
You could also use '=SUM(A1,B1)' where you list all the cells you want to add with commas in between.
Yes you can do that, it won't hurt the computer.
A deque is a type of list
I think it is C. cross-site scripting
Answer:
Its the pattern puzzle game.
Explanation:
The answer is straight forward. Its a pattern puzzle game, and here we need to change everything to same color, and that is a pattern of this pattern game. Many forms of such pattern games are available, but this one happens to be the most popular among them all, and is widely used by various people of all ages to pass their time.