The chance of an event happening is the square of the chance of a second event but the odds against the first are the cube of the odds against the second. The chances of the events are
A
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B
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C
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D
None of these
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Solution
The correct option is A Let p1,p2 be the chances of happening of the first and second event respectively, then according to the given conditions, we have p1=P22 and 1−p1p1=(1−p2p2)3 ⇒p2=13 and so p1=19