Question

Select the most appropriate option to identifythe missing number, represented by ? in the series.
$120,320?2070,5195,13007.5$

• A. $800$
• B. $920$
• C. $850$
• D. $820$

Answer 1

The correct option is D $820$

$120,320,?,2070,5195,13007.5$

$120\times \frac{5}{2}+20=320$

$320\times \frac{5}{2}+20=820$

$820\times \frac{5}{2}+20=2070$

$2070\times \frac{5}{2}+20=5195$

$5195\times \frac{5}{2}+20=13007.5$

$\therefore 820$ is correct Answer