Search any question & find its solution
Question:
Answered & Verified by Expert
A box contains 3 white and 2 black balls. Two balls are drawn at random one after the other. If the balls are not replaced, what is the probability that both the balls are black?
Options:
Solution:
2181 Upvotes
Verified Answer
The correct answer is:
$1 / 5$
Total number of balls $=5$ Number of black balls $=2$ Required probability $=\frac{\mathrm{n}(\mathrm{E})}{\mathrm{n}(\mathrm{S})}=\frac{{ }^{2} \mathrm{C}_{1} \times{ }^{1} \mathrm{C}_{1}}{{ }^{5} \mathrm{C}_{2}}=\frac{2}{5} \times \frac{1}{2}=\frac{1}{5}$
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.