Questions
An ordinary dice is rolled for a certain number of times. If the probability of getting an odd number 2 times is equal to the probability of getting an even number 3 times, then the probability of getting an odd number for odd number of times is:
detailed solution
Correct option is C
P(odd no. twice) = P(even no. thrice)⇒ nC212n= nC312n⇒n=5success is getting an odd number then P(odd successes) = P(1) + P(3) + P(5)= 5C1125+ 5C3125+5C5125=1625=12Similar Questions
The probability of an event A occuring is 0.4 and of B occuring is 0.2. If A and B are mutually exclusive events then the probability of neither A nor B occuring is
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