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There are four boxes A1,A2,A3 and A4. Box Ai has i cards and on each card a number is printed, the numbers are from 1 to i. A box is selected randomly, the probability of selection of box Ai is i∑i and then a card is drawn. Let Ei represents the event that a card with number 'i' is drawn. P(E1) is equal to

Answer»

There are four boxes A1,A2,A3 and A4. Box Ai has i cards and on each card a number is printed, the numbers are from 1 to i. A box is selected randomly, the probability of selection of box Ai is ii and then a card is drawn. Let Ei represents the event that a card with number 'i' is drawn.

P(E1) is equal to




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