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Excel Magic Trick 466: SUM every Nth value SUMPRODUCT, MOD & ROW functions

See how to SUM every Nth value using SUMPRODUCT, MOD and ROW functions. See two alternative formulas, each for a different situation:
1.SUMPRODUCT & MOD & ROW for range starting in cell A1
2.SUMPRODUCT & MOD & 2 ROW functions for range starting in any cell
Sum every 3rd, 26th, etc. value.

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