Management Aptitude Test 2017 Paper

Question : 87 of 200

Marks: +1, -0

First bag contains 5 white and 4 black balls. Second bag contains 7 white and 9 black balls. A ball is transferred from the first bag to the second and then a ball is drawn from the second bag. Find the probability that the ball drawn is white.

$7/18$
$5/9$
$4/9$
$11/18$

Validate

Solution:

	White Balls	Black Balls
Bag 1	5	4
Bag 2	7	9

∴ Probability of drawing a white ball from bag 2 when one ball is transferred from bag 1 .
=

5/9×8/17+4/9×7/17

{40+28}/153=4/9

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