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Q.

One hundred students appeared for two examinations 60 passed in first, 50 passed the second and 40 passed both. The probability that a student selected at random has failed in both examinations is

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a

310

b

45

c

35

d

17

answer is A.

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Detailed Solution

p(A¯∩B¯)=1−p(A∪B)               =1−60+50−40100=310
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