Question

Which pair of numbers comes next?
$10,18,12,21,15,25,,....$

• A. $19,30$
• B. $19,27$
• C. $30,19$
• D. $27,19$

Answer 1

The correct option is A $19,30$

This is an alternating addition series

First series = $10,10+2=12,12+3=15$. $\therefore$ next number= $15+4=19$
Second series = $18,18+3=21,21+4=25$ $\therefore$ next number = $25+5=30$
The next pair of numbers are $19,30$.