Question

Which pair of numbers comes next?
$25,23,5,20,16,5,....$

• A. $11,5$
• B. $5,6$
• C. $10,5$
• D. $9,5$

Answer 1

The correct option is A $11,5$

This is an alternating subtraction series with the interpolation of a random number, $5$, as every third number.
In the subtraction series, $2$ is subtracted, then $3$ then $4$, and so on.
The next pair of numbers are $11$ and $5$.