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Why do we mark tlc plates with pencil and not with pen

What is the most important for you to choose before you build a network?

Use a while-end loop in a script file to calculate the sum of the first n terms of the series: summation sign on the top n bottom k=1 : )^k * k^2 +5k)/3^k show the script file and the two results of n = 10 and n = 20.