When do I need to make the (random(1,10) one more than what I need?

I know that when allowing the game to choose a random number, under certain circumstances, you need to add one more number, but I don't know when to do that and I think it's messing with my game.

Example: Set variable: gameLayout to floor(random(1,10))

If I have 10 layouts and the variable chosen dictates the layout played, do I need to make the number in the parenthesis 1,10 or 1,11?

When do I need to make it 1 more and when do I need to make it the correct amount?

Thank you.

The expression before random also has an effect so in this case floor rounds the value down so it will never choose 10 for (1,10). If you use ceil instead of floor then it would pick 10 but not 1 because it rounds up. You could always just use choose() then you know the available values.

instead of all your events just try this: