Question

Find the missing term.

4	7	11	16
7	13	21	?

• A. $27$
• B. $29$
• C. $31$
• D. $33$

Answer 1

The correct option is C $31$

The difference between lower numbers is equal to double the difference between the upper numbers like:
$2\ast (7-4)=13-7$
Similarly
$2\ast (16-11)=x-21$
Here $x=31$
Hence, option 'C' is correct.