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The probability that a teacher will give a surprise test during any class is 1/5. If a student is absent on two day what is the probability that he will miss atleast one test.

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Liebermann's test is used for which class of compounds -

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The probability that a teacher will conduct an unannounced test during any class meeting is 1/4 . If a student of the class is absent twice, then the probability for the student to miss at least one test is (A) 3/16 (B) 6/16 (C) 1/16 (D) 7/16

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The marks scored ina test by a class of 25 boys are as folowing

The probability that a teacher will conduct an unannounced test during any class meeting is (1)/(4) .If a student of the class is absent twice, then the probability for the student to miss at least one test is