Division A and B in a school have 20 students each. One student is to be selected from each division. What is the probability that Rahul in division .A will be selected, if 2 students are selected out of 40 students ?
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The Probability of selecting Rahul from class A is 1/20 and the probability of selecting 2 students out of both the classes is 2/40 i.e. 1/20 again.
So we have 2 equations here:
P(Rahul gets selected from class A) = 1/20
P(2 Students get selected from both classes) = 1/20
P(Rahul gets selected) = 1/20*1/20 = 1/40
So we have 2 equations here:
P(Rahul gets selected from class A) = 1/20
P(2 Students get selected from both classes) = 1/20
P(Rahul gets selected) = 1/20*1/20 = 1/40
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