Box I contains three cards bearing numbers 1, 2, 3 ; JEE Advance 2014 Paragraph based on Probability

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In this video, I am discussing a paragraph problem that was asked in JEE advance 2014 and was from chapter Probability.

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Box I contains three cards bearing numbers 1, 2, 3; box II
contains five cards bearing numbers 1, 2, 3, 4, 5; and box III
contains seven cards bearing numbers 1, 2, 3, 4, 5, 6, 7. A card
is drawn from each of the boxes. Let xi be the number on the
card drawn from i th box i = 1,2,3. (2014 Adv.)
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