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A six-faced fair dice is shown until 1 comes. Then the probability that 1 comes in even number of trials is
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a
5/11
b
5/6
c
6/11
d
1/6
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Correct option is A
In single throw of a dice, probability of getting 1 is 1/6 and probability of not getting 1 is 5/6.Then, getting 1 in even number of chances is getting 1 in 2ndchance or in 4th chance or in 6th chance and so on. Therefore, the required probability is56×16+563×16+565×16+⋯+∞=53611−2536=536×3611=511Similar Questions
The odd against an event are 5 to 2 and the odds in favour of another disjoint event are 3 to 5. Then the probability that atleast one of the events will happen is
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