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There are four boxes A1,A2, A3 and A4. B...

There are four boxes `A_1,A_2, A_3` and `A_4`. Box `A_i` 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 `A_i` is `i/10` and then a card is drawn. Let `E_i` represents the event that a card with number i' is drawn.

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