1.

A faircoin is tossed until one of the 2 sides occurs twice is row. Probability that even number of tosses required is.

Answer»

<P>`1/3`
`2/3`
`1/2`
`3/4`

SOLUTION :A={HH, HTHH, HTHTHH,…}
B={TT, THTT, THTHTT,…}
P(A) = P(B) = `1/4 + 1/16 + …………. " to" propto =1/3`
`P(A cup B) = 1/3 + 1/3 = 2/3`


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