math.random printing the same number forever?

What I'm trying to do is when a player joins this game, it will roll a number between 1 and 3, If its 1 gui1 opens, and if its 2 or 3 gui2opens, my problem is the first player to join the game, lets say they get a 2 roll, everyone else gets a 2 role, not a 3 or 1. Even when the odds are raised to 1 and 10 it does the exact same thing. No errors. Besides that, the code works fine.

CODE:

local players = game:GetService("Players")

local num = math.random(1,10)



players.PlayerAdded:Connect(function(players)


    if num == 1 then

        game.StarterGui.gui1.Enabled = true
        print(num)
    else
        game.StarterGui.gui2.Enabled = true
        print(num)
    end



end)

thanks :)