n=1∑10​n(1+n+n2)=? Now, how would you write a formula to find this sum automatically based on the number entered in the cell? To run this applet, you first enter the number n you wish to have illustrated; space limitations require 0 Module, and paste the following code in the Module Window.. VBA code: Sum all digits of a cell number Then solve the above recurrence for sa,ns_{a,n}sa,n​ to get. Here n= 5; Sum of digits = 2+3++5+7+9 = 26. Each argument can be a range, a number, or single cell references, all separated by commas. 3 \left( \sum_{k=1}^n k^2 \right) &= n^3 + 3 \frac{n(n+1)}2 - n \\ Then the relevant identity, derived in the same way from the binomial expansion, is. a=1/2. 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