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A box contains 2 green and 3 red balls of identical size. If two balls are picked randomly, one after the other, without replacement, what is the probability of picking two balls of different colours?
A bag contains 5 red balls and 3 green balls. Two balls are picked, one after the other with replacement. The probability the both are the same colour is
The chances of occurrence of three independent events X,Y and Z are 1/3, ¼ and 2/5. What are the chances of occurrence of only Y and Z?
Two dice are thrown at the same time. What is the probability that the sum will be 7 or 11?
The table below gives the marks scored by a group of students in a test.
Mark 0 1 2 3 4 5
Frequency 1 2 7 5 4 3
What is the probability of selecting a student from the group that scored 2 or 3?