Question

Identify the term that will replace the ?

$3,5,9,17,33,65,?$

• A. $78$
• B. $126$
• C. $129$
• D. $127$

Answer 1

Answer: (C)

$129$

1st term $=3$

2nd term $=$ 1st term $+2^1=5$

3rd term $=$ 2nd term $+2^2=9$

4th term $=$ 3rd term $+2^3=17$

5th term $=$ 4th term $+2^4=33$

6th term $=$ 5th term $+2^5=65$

Hence the missing term $=$ 6th term $+2^6=129$.