Hi guys, Anybody knows how to randomly choose one of two numbers but with specifying a probability. For exemple, each time randomly choose one of two colored balls, knowing that you have a 75% probality to choose the red ball. something lke that...any ideas? I would really apreciate the help thank you in advance

I think you need to get clear about some concepts. If it's truly random, which ain't easy to implement, the chance of either is 50%. M2 If at first you don't succeed, you're about average.

Math.random() returns a double from a uniform distribution in [0.0,1.0) does it not? How often will it return a number less than 0.75?

You can load the probability by choosing a selection value of greater than .25 instead of .5 for a 75% chance rather than a 50% chance.

Thank you guys a bunch. I couldnt figure it out even if its too simple. No need then to have a special function to do that for you in Java. something like this I guess should work: Random rand = new Random(); int choice = (rand.nextInt(100)<75) ? 1 : 0; it should pick the number 1 with a probability of 75% :-) Gotta get back to my code now! Thanks for the tip guys Sane