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I have a problem : i don't know how to verify a Value like A

I have A which can be 1, 2 or 3

and i do
but doesn't seem to work

math.random(1,3)

Not sure if that includes 1 and 3.
If you want whole numbers:

math.floor(math.random(1,3) + 0.5)

EDIT: you changed your question. A==1 will work if a is 1. Use print(dump(A)) to find out its true value.
If it's something like "1" then use tonumber(A)==1
If it's something like 1.02 then you can round it to check whether the closest whole number is 1: math.floor(A + 0.5) == 1

note that math.floor always rounds down, which is why you need to +0.5.
round(A) == floor(A + 0.5)

http://lua-users.org/wiki/MathLibraryTutorial

thx :)

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