Box I contains 30 cards numbered 1 to 30 and Box II contains 20 cards numbered 31 to 50. A box is selected at random and a card is drawn from it. The number on the card is found to be a non-prime number. The probability that the card was drawn from Box I is:
Option: 1
Option: 2
Option: 3
Option: 4
Let E be the event where the selected card is non-prime.
For B1 : Prime numbers: {2, 3, 5, 7, 11, 13, 17, 19, 23, 29}
For B2 : Prime numbers: {31, 37, 41, 43, 47}
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