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There are four boxes B(1), B(2), B(3) an...

There are four boxes `B_(1), B_(2), B_(3) and B_(4)`. Box `B_(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 selecting box `B_(i)` is `(i)/(10)` and then a card is drawn.
Let `E_(i)` respresent the event that a card with number 'i' is drawn, Then :
Q. `P(E_(1))` is Equal to :

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