[R] How to create additional columns?

[kayj]

I do have some data of dim 100*3 (i.e  100 rows and 3 columns ) stored in a
txt file. I want to read the data into R,  Perform the same operation in
each row and store the result in a forth column( that I should create). 
I do not know how I can create a forth column to store the result of the
operation for each row?





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