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The Free IQ Test
Fast, Free & Accurate Online IQ Test
IQ Test Scale
What is IQ?
Some Genius IQs
High IQ Societies
History of IQ
Brain Teasers
Practice IQ Questions
IQ Articles
Difficulty Level:
Easy
Stats: 1,954 / 3,045 ( 64.17% ) got this right
Find the missing number in the series below.
3, 7, 6, 5, 9, 3, 12, 1, 15, ?
-1
3
4
5
7
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