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solving task 3 in aict paper 4 mayjune2010

S

Saif-ur-Rehman

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hi guys i cant seem to figure out the task 3 in applied ict paper 4 mayjune2010.
can someone please help me?. I know that we are to use lookup function but in the mark scheme it says that the Result=c-k2:c-k21. What is that supposed to mean?

Please helpppp
 
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