Random brick spawning script broken?

Good attempt but you have used math.random incorrectly and your variables are useless.

In your code you have told math.random to start at 1, end at 2 and increment by 3 each time. (Which is impossible!) Math.random should be used like this: math.random(starting number, end number, [increment])

Your variables are not getting used in your code so i have replaced them with an array (table)

Below i have changed and fixed your code.

--NilLogic

Objects = { --Define the different objects
"Part",    --Index of 1
"Wedge",  --Index of 2
"Cylinder"   --Index of 3
}

 --[[
objects[1]  would return "Part"
objects[2]  would return "Wedge"
objects[3]  would return "Cylinder"

Instance.new(objects[1])  would create a new part.
Instance.new(objects[2])  would create a new wedge.
Instance.new(objects[3])  would create a new cylinder.

Using math.random we can select one of the above commands to be run
math.random(1,3)  will return either 1, 2 or 3

Which allows us to select an object at random.
objects[math.random(1,3)]  would return either "Part", "Wedge" or "Cylinder"

So finally we can create an object at random by combining all the code together.
Instance.new(objects[math.random(1,3)]) 
--]]

while true do
        Instance.new(objects[math.random(1,3)]) 
    wait(.5)
end