NIACL Model Paper 3 with solutions for free online practice

Question : 30 of 100

Marks: +1, -0

An urn contains 4 green and 7 blue marbles. If three marbles are picked at random, what is the probability that only two of them are blue?

Solution:

The required probability

= {^7C_2×^4C_1}/{^11 C_3}={21×14}/165=28/55

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