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Sometimes you can look for patterns in questions to solve seemingly impossible questions.
What is the units digit of 3801?
Am I going to sit here and calculate
3801? Will they have to call security to get me out of the test center after it closes? Surely that sneaky Mr. GMAT must have made this question with a shortcut!
Indeed, use Find Patterns and it shows up pretty quickly:
31= 3
32= 9
33= 27
34= 81
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