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In a class, 60% of the students know les...

In a class, 60% of the students know lesson I , 40% know lesson II and 20% know lesson I and II. A student is selected at random . The probability that the student does not know lesson I and lesson II is .

A

a) 0

B

b) 4/5

C

c) 3/5

D

d) 1/5

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