Redo exercise 6 assuming that the urn contains 30 red balls and 40 blue balls.
To use a tree diagram to calculate that both balls are red, the probability that the first ball is red and the second is not, the probability that the first ball is not red and the second is red, the probability that neither ball is red.
An urn contains red balls and blue balls. Two are chosen at random one after the other without replacement.
Let first ball is red.
first ball is blue.
second ball is red.
second ball is blue.
Total balls .
Now calculate the probabilities on first draw
Now on the second draw if the red ball is already taken out, number of red balls will be and if blue ball is taken out the number of blue balls will be and the total number of balls
What is the probability that the second ball is red?
To find the probability that at least one of the balls is red.
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