Help with script writing?

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# 1  
Help with script writing?

I am new for script writing. I have a file named as name.dat and contain numbers with different rows and columns. I want to sum numbers at one row with that of at another row; like row1 + row101 + row 201, with corresponding columns. Any one can help me to write a script for this operation.

Thank you in advance.
# 2  
Is that homework / assignment?
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