Question

Find the next number of the series.
$7,10,8,11,9,12,....$

• A. 9
• B. 10
• C. 8
• D. 7

Answer 1

Answer: (B)

10

The next number is $10$.
The first $2$ numbers difference is $3$.
The second $2$ numbers difference is $2$.
So, this is simple alternating addition of $3$ and subtraction of $2$.