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Using a specialized array formula to identify data that's been duplicated

Using a specialized array formula to identify data that's been duplicated: Excel 2016: Managing and Analyzing Data
Using a specialized array formula to identify data that's been duplicated: Excel 2016: Managing and Analyzing Data

To identify list records that have been duplicated, first sort the list by a column that has duplicates. In a nearby empty column fill it with an array formula that compares each cell in one row with each cell in the same column in the next row. For example: =IF(AND(B2:K2=B3:K3),"Dup","Unique"); press Ctrl+Shift+Enter.

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