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 wi

Monjur Alahi

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.
A. `4/5`
B. `2/5`
C. `7/25`
D. `9/25


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Salim Ahmed Kawsar

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Correct Answer - D
Probability that one test is held `=2xx1/5xx4/5=8/25`
Probability that tese in held on both days `1/5xx1/5=1/25`
`therefore` Probability that the student misses at least one test
`=8/25+1/25=9/25`

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