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Formula lab
Pick a spreadsheet formula — then prove it on known rows.
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Formula lab
Goal: total Revenue for region West in June (cell F2). Pick a formula, then run tests.
Sample table · Date · Customer · Region · Revenue
2026-06-02 Ada West 120 2026-06-08 Bo East 90 2026-06-15 Cy West 210 2026-05-20 Dee West 400 2026-06-28 Eli West 75