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If {n} persons are seated on a round table, what is the probab
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If persons are seated on a round table, what is the probability that two named individuals will be neighbours?

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If 12 identical balls are to be placed in 3 identical boxes, then the probability that one of the boxes contains exactly 3 balls is :

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Question 2
It is given that the events A and B are such that Then P(B) is:

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Question 3
A card is drawn at random from a well-shuffled deck of playing cards. Find the probabilitythat the card drawn is (a) a spade or an ace (b) a black king (c) neither a jack nor a king (d) either a king or a queen.

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Question 4
Five bad oranges are accidently mixed with 20 good ones. If four oranges are drawn one by one successively with replacement, then find the probability distribution of number of bad oranges drawn. Hence find the mean and variance of the distribution.

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Question Text
If persons are seated on a round table, what is the probability that two named individuals will be neighbours?