Q.

The probability that a teacher will conduct an unannounced test during any class meeting is 13 . If a student of the class is absent thrice, then the probability for the student to miss at least one test is

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a

1127

b

1627

c

1927

d

827

answer is C.

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Detailed Solution

=1−teacher will not conduct any test when student was absent=1−3C0(13)0(23)3=1−827=1927
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The probability that a teacher will conduct an unannounced test during any class meeting is 13 . If a student of the class is absent thrice, then the probability for the student to miss at least one test is