Question

Find out the wrong number in the series given below :
$6,13,27,55,110,223$

• A. $27$
• B. $55$
• C. $110$
• D. $223$

Answer 1

The correct option is C $110$

$\text{2nd term}=\text{1st term}\times 2+1$
$=6\times 2+1=13$
$\text{3rd term}=\text{2nd term}\times 2+1$
$=13\times 2+1=27$
$\text{4th term}=\text{3rd term}\times 2+1$
$=27\times 2+1=55$
$\text{5th term}=\text{4th term}\times 2+1$
$=55\times 2+1=111\ne 110$
$\text{6th term}=\text{5th term}\times 2+1$
$=111\times 2+1=223$
$\therefore 110$ is wrong.