Array Searching For First Duplicate

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In this Ruby programming exercise we're going to have some fun because we're going to figure out how we can find the

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This is the video to find the

Array

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Given a list of only numbers, find the

In this video we will see how to detect whether an

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Try this instead: IFERROR(INDEX($A$2:$A$23, SMALL(IFERROR(1/(MATCH(A$2:A$23, A$2:A$23, ...