Three cards are chosen at random from a standard 52-card deck. What is the probability that they are not all the same color?
So what I'm thinking is that the first card doesn't matter and there is 1/2 and 1/2 for the next two cards so is the answer 1/4?
If not or If so, PLEASE GIVE EXPLANATION WITH ANSWER.
First calculate the probability, q, that they are all the same colour!
Probability that second card is same colour as first: q1 = 12/51 (12 cards of same colour to choose from out of 51 cards left).
Probability that third card is also same colour: q2 = 11/50
Hence q = q1*q2 or q = 12*11/(51*50)
Probability, p, that they are not all same colour: p = 1 - q