My math.random on touch script isn't working properly, help?

function onTouched()
    math.randomseed(tick())
    local partchoice = math.random(1,3)
    if partchoice == 1 then
        game.Workspace.part1:Destroy()
        script.Parent:Destroy()
    end
    if partchoice == 2 then
        game.Workspace.part2:Destroy()
        script.Parent:Destroy()
    end
    if partchoice == 3 then
        game.Workspace.part3:Destroy()
        script.Parent:Destroy()
    end
end
 
script.Parent.Touched:connect (onTouched)

I was given the suggestion of using tick, so i tried to add it and still it didn't work... I kept messing around with it and tried to get it to work but still nothing was right, can anyone help me and tell me what i did wrong? :/