ProbabilityHard
Question
A die is thrown a fixed number of times. If probability of getting even number 3 times is same as the probability of getting even number 4 times, then probability of getting even number exactly once is
Options
A.1/4
B.
C.
D.
Solution
According to the given condition
nC3
= nC4 
, where n is the number of times die is thrown
⇒ nC3 = nC4 ⇒ n = 7
Thus required probability = 7C1
nC3
= nC4 , where n is the number of times die is thrown⇒ nC3 = nC4 ⇒ n = 7
Thus required probability = 7C1
Create a free account to view solution
View Solution FreeMore Probability Questions
If n different objects are distributed among n + 2 persons, then...The probability that a non leap year will have 52 Fridays is-...The probability that at least one of the events A and B occurs is 0.6. If A and B occur simulta neously with probability...A bag contains 4 red and 6 black balls. A ball is drawn at random from the bag, its colour is observed and this ball alo...Before a race the chance of three runners A, B & C were estimated to be proportional to 5, 3 & 2 respectively but during...