class 11

Math

Algebra

Probability I

For three events $A,B$and $C,P$(Exactly one of $A$or $B$occurs) $=P$(Exactly one of $B$or $C$occurs) $=P$(Exactly one of $C$or $A$occurs) $=41 $and $P$(All the three events occur simultaneously) $=61 ˙$Then the probability that at least one of the events occurs, is : $647 $ (2) $163 $ (3) $327 $ (4) $167 $