Question

In the questions a number series is given with one term missing shown by question mark(?). This term is one of the four alternatives given under it. Find the right alternative.
$97,77,59,?,29,17$

• A. $34$
• B. $39$
• C. $37$
• D. $43$

Answer 1

The correct option is D $43$

From the given series, we get

$97-77=20$

$77-59=18$

The difference between two successive terms in the sequence is decreasing by $2$.

So, after $20,18$ the next difference should be $16$

$\therefore 59-x=16$

$\Rightarrow x=43$