how I can show interstitial ads with a random presentation

Question

hello I want to show interstitial ads with a random click on button example if I click on wallpaper 3 times the interstitial ads is showing up I want to add a function to showing Interstitial randomly after click, between 3 to 10 click

this my code :

if (Config.Counter == 2){
Config.Counter = 0;
new InterstitialAdMobModel(activity);
}else{
Config.Counter ++;
}

Answer 1

                if (Config.Counter >= random ){

                    Random rand = new Random();
                    random = rand.nextInt((max - min + 1) + min);
                    new  InterstitialAdMobModel(activity);
                    Config.Counter = 0;
                }else{
                    Config.Counter ++;

                }