Questions
There are 20 cards. Ten of these cards have the letter “I” printed on them and the other 10 have the letter “T” printed on them. If three cards are picked up at random and kept in the same order, the probability of making word IIT is
detailed solution
Correct option is B
Consider the following events:A : getting a card with mark I in first draw B : getting a card with mark I in second draw C : getting a card with mark T in this drawThen, the required probability isP(A∩B∩C)=P(A)P(B/A)P(C/A∩B) =1020×919×1018=538Similar Questions
A couple has 3 children and it is known that atleast one of them is a boy. Then the probability that the couple will have exactly two boys is
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