SOLUTION: .If ‘n’ goes from 1 to 3 and the summation of ‘na’ = 6a, then what will be the value of ‘a’?

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Question 841756: .If ‘n’ goes from 1 to 3 and the summation of ‘na’ = 6a, then what will be the value of ‘a’?
Answer by richwmiller(17219) About Me  (Show Source):