FormuladrillFlag duplicate orders
An Excel formula exercise from Formuladrill. Solve it with a formula bar on a live sheet in your browser, and it is checked the moment you submit.
The task
From Sam in Support: "Some orders were imported twice. In C2:C9, write Duplicate next to every order ID that appears more than once, and leave the others blank."
What this exercise teaches
COUNTIF over a locked range is the standard duplicate check. Flagging both copies lets someone decide which one to keep.
A hint if you get stuck
COUNTIF($A$2:$A$9,A2) counts how often this ID appears in the whole column. Wrap it: IF(... > 1, "Duplicate", "").
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