CLEAR
Toprankers-Info

+91 7676564400

Mobile App

Get it on Google Play
Discussions
Tags:

Articles

Discussions
Submit Discussion
VIDHYASAGAR

· started a discussion

· 1 Months ago

prob (Question:122432.0)

how 2/5 comes

Question:

A bag contains 6 white and 4 red balls. Three balls are drawn one by one with replacement. What is the probability that all 3 balls are red?

Options:
A) \(\cfrac{8}{125}\)
B) \(\cfrac{1}{20}\)
C) \(\cfrac{1}{30}\)
D) \(\cfrac{1}{120}\)
E)

None of these 

Solution:

Ans: (a) P (of Red ball in first attempt) = \(\cfrac{4}{10} \ = \cfrac{2}{5}\)

Here probability will remain same for the next two attempt.

\(\therefore\) Probability = \(\cfrac{2}{5} × \cfrac{2}{5} ×\cfrac{2}{5} = \cfrac{8}{125}\) 

Knowledge Expert

· commented

· 1 Months ago

Dear student
There was a typing error in the question. We have fixed it now.

Regards
Team TR
-logo
We at aim to provide most comprehensive content & test for practice which is carefully divided into various chapters and topics to help you focus on your weak areas.Our Practice mock test gives you unmatched analytics to help you realize your strong areas,time management and improvement areas.Our Short & Crisp notes on each topic will help you to quickly revise the topic along with the tips & tricks of the exams.
More About
-Info
-Info

Mobile App

Get it on Google Play
About Us Campus Ambassador Careers Contact Us Refund Policy

All Rights Reserved Top Rankers

User Policy
Disclaimer
Terms & Conditions