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If the probability for A to fail in an e...

If the probability for A to fail in an examination is 0.2 and that for B is 0.3, then the probability that either A or B fails, is (A) 0.38 (B) 0.44 (C) 0.50 (D) 0.94

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Given , P(A fails in examination)=0.2
and P(B fails in examination)=0.3
`P(AnnN)=P(A)P(B)=(0.2)(0.3)`
`:. P(AuuB)=P(A)+P(B)-P(AnnB)`
`0.2+0.3-0.06=0.44`
Hence, it is a false statement.
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IIT JEE PREVIOUS YEAR-PROBABILITY-TOPIC 2 ADDITION AND SUBTRACTION LAW OF PROBABILITY OBJECTIVE QUESTION II (TRUE /FASLE )
  1. If the probability for A to fail in an examination is 0.2 and that for...

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