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IQ Brain Teaser #80 Replace the ? with the correct number in the following series: 1100 1120 1200 100 220 400 ? 500 700 900 1100 1300 1500 1700 1900 2100 None of the above view results Back to top | Back to Main Page of Puzz.com - IQ Tests, Puzzles, Games & Contests ©2016 Puzz.com, LLC & respective partners. All rights reserved. Our IQ tests are for entertainment purposes only. Privacy Policy