A) \[\frac{1}{5}\]
B) \[\frac{1}{7}\]
C) \[\frac{5}{7}\]
D) \[\frac{5}{6}\]
Correct Answer: A
Solution :
(a): Let ?U? be universal set; U = 100 students no. of failed students \[=n\left( U \right)-n\left( A\cup B \right)=100-80=20\] From the figure it, is evident that 80 students passed at least 1 exam. Thus, 20 failed both and the required probability is 20/100=1/5.You need to login to perform this action.
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