Probability Practice Test 1

Question : 18 of 40

Marks: +1, -0

An urn contains 8 blue and 4 green balls. Two balls are drawn at random. The probability that both balls are of the same colour (all balls are considered to be different) is

$17/33$
$1/33$
$14/33$
$1/11$

Validate

Solution:

Required probability

={^8C_2+^4C_2}/{^12C_2} =17/33

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