Find the odd man out. 1, 4, 9, 16, 20, 36, 49
Answer: C
The pattern is 1⊃2;, 2⊃2;, 3⊃2;, 4⊃2;, 5⊃2;, 6⊃2;, 7⊃2;. But, instead of 5⊃2;, it is 20 which to be turned out.