Question: A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
My approach towards the answer is:
I will find the total number of cases: selecting 2 balls out of (2+3+2).
I will find total number of cases which have no blue: selecting 2 balls out of (2 red + 3 green).
Here my question is: in the question no information is given for the replacement.
So what should I take it as: with replacement or without replacement?