when i use RAND() to choose no between 1-15, every time i do it, no changes, how to stop that happen?
Example: A1-1,A2-3,A3-12,but when i do A2, A1 change to different no.

and what can i do if i want to pick random no between 1-15 but i dont want 8 to show up?

what can i do if i want a1-a140 showing random no between 1-15, but every no show up equally?