Question bank/JEE Main/Mathematics
JEE MainMathematics
Two urns A and B contain marbles. Urn A holds 12 black marbles and 4
white marbles. Urn B contains 6 black marbles and 5 white marbles. A
marble is chosen at random from Urn A and placed in Urn B. The
probability that a marble then chosen from Urn B is black, is
Show answer and solution
E1: Marble transferred from A to B is black.
E2: Marble transferred from A to B is white.
E: Marble drawn from B is black.
[IMAGE] P(E) = P(E1) · [IMAGE] =[IMAGE]
E2: Marble transferred from A to B is white.
E: Marble drawn from B is black.
[IMAGE] P(E) = P(E1) · [IMAGE] =[IMAGE]
Source: Grass-G / M-01 Mathematics Paper-1.docx
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