The question is if i have 5 red balls, 4 green balls, 6 blue balls and we get 5 balls at random.

Now i know that all the combinations for these 5 balls are 3003.

I also know that the probability for those five balls to be all blue is 6/3003.

Another thing i know is the probability of the 5 chosen balls to NOT have green balls is 462/3003.

I am guessing that for the 5 chosen balls to have 1 red, 1 green and 3 blue balls is maybe 1260/3003.

But i don't understand how to calculate the probability of AT LEAST ?

What is the probability that AT LEAST one ball is blue.

I have some examples of how to use combinations but i have no idea what to do when i am asked the question with the words AT LEAST in it and i don't have any examples in my book about this specific problem.

Can any one guide me or tell me how would they go around it ?