Question

Question no. 9 this is of number series, can someone tell me how to solve this and what pattern does it make?

Answer 1

ans is 28 ..you can see the difference between the numbers are increasing by 4...like 6-1=5,then15-6=9 then 28-15=13, and so on and the difference series is 5,9,13,17,21,...

Answer 2

1+5=6,6+9=15,15+13=28,28+17=45.........is the right sequence