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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