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.
The most common operating system for personal computers is Windows.
<span>Answer: Disk Management Console</span>
In tabular form the data is displayed in a table layout following a continuous series of records. In this almost all the records are displayed in a single layout. While in columnar form the data is displayed one record at a time.