A box contains 3 white balls and 7 black balls. Another box contains 4 white balls and 6 black balls. If we choose one ball each from the two boxes without looking into the boxes, a) What is the probability of getting two balls with the same colour? b) What is the probability of getting two balls with different colours?
Answers
Answer:
Thus, the probability of black balls =30+xx
Thus, the probability of black balls =30+xxand the probability of white balls =30+x30
Thus, the probability of black balls =30+xxand the probability of white balls =30+x30Given: Probability of black ball =52× probability of white ball
Thus, the probability of black balls =30+xxand the probability of white balls =30+x30Given: Probability of black ball =52× probability of white ball30+xx=52×x+3030
Thus, the probability of black balls =30+xxand the probability of white balls =30+x30Given: Probability of black ball =52× probability of white ball30+xx=52×x+30305x=60
Thus, the probability of black balls =30+xxand the probability of white balls =30+x30Given: Probability of black ball =52× probability of white ball30+xx=52×x+30305x=60x=12
Thus, the probability of black balls =30+xxand the probability of white balls =30+x30Given: Probability of black ball =52× probability of white ball30+xx=52×x+30305x=60x=12Hence, the number of black balls =12.