Question

how to do 1,3,6.11,18?​

Answer 1

Answer:

Here the difference between first two terms - 3-1=2

between 6-3=3

between 11-6=5

between18-11=7

So all the differences are 2,3,5,7...

And this shows that all are the odd no.

So just complete this series by adding odd no. in last no. ex.

18+9=27 , 27+11 = 38 , 38 + 13 = 51 , 51+15=66......

Hence the series will be,

1,3,6,11,18,27,38,51,66.....and so on....