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Practice · 3 of 3

The last-ten-minutes audit

CHALLENGE
Difficulty: intermediate+25 XP

You have 4 minutes left and an FRQ method still unguarded. Which two point-savers does the protocol demand? The method below should return the FIRST reading below 0.0 or 999.0 when none. Add BOTH: the empty-input guard and the sentinel return.

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