What Comes Next In The Sequence: 1, 9, 18, 28…? - with Answer

Can you find the connection between the sequence numbers 1, 9, 18, 28 and guess the next number in the sequence. Scroll below for the answer.

Answer: 

39 is the next number in the sequence

How to obtain

1 + 8 =  9

9 + 9 = 18

18 + 10 = 28

28 + 11 = 39

So you will get the answer if you add the number with 8 + x, where x increases by 1.