Question

What comes after 39
3,6,9,15,24,39

Answer 1

63

Explanation:

from the 3rd element onwards you are adding up the previous 2 entries.

in particular

`9 = 6 + 3 \\ 15 = 9 + 6 \\ 24 = 15 + 9 \\ 39 = 24 + 15`

keep adding and you get

`24 + 39 = 63`