Comprehension - There are four boxes \( B_{1}, B_{2}, B_{3} \) and \( B_{4} \). Box \( B_{i} \) ...

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Comprehension
- 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 \( \frac{i}{10} \) and then card is drawn.
Let \( E_{i} \) represent the event that a card number \( i \) is drawn. Then \( P\left(E_{1}\right) \) is equal to
(a) \( \frac{1}{5} \)
(b) \( \frac{1}{10} \)
(c) \( \frac{2}{5} \)
(d) \( \frac{1}{4} \)
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