Question

Which number does not belong in the series below?
2, 5, 10, 17, 26, 37, 50, 64

• A. 17
• B. 37
• C. 64
• D. 26

Answer 1

The correct option is C 64

$2,5,10,17,26,37,50,64$

$2=1^2+1,5=2^2+1,10=3^2+1,17=4^2+1,26=5^2+1,37=6^2+150=7^2+1,64=8^2$

So, 64 is the incorrect term