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in cell a1 i have 4099227911503, i know that if i add these numbers up, the sum would be 52. how do i write a formula that will do the same thing. i need to add the numbers with in the cell so that i can do a mod 10 to get the check digit. i am creating a data base for merging with envelopes and i need to put the planet code "a1" with a check digit
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