Question

Find out the wrong number in the series given below :
$6,13,18,25,30,37,40$

• A. $25$
• B. $30$
• C. $37$
• D. $40$

Answer 1

The correct option is D $40$

The difference between two successive terms from the beginning are $7,5,7,5,7,5$ i.e.,
$\text{2nd term}-\text{1st term}=13-6=7$
$\text{3rd term}-\text{2nd term}=18-13=5$
$\text{4th term}-\text{3rd term}=25-18=7$
$\text{5th term}-\text{4th term}=30-25=5$
$\text{6th term}-\text{5th term}=37-30=7$
$\text{7th term}-\text{6th term}=40-37=3\ne 5$
So, $40$ is wrong.