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saurabh9gupta
Joined: 10 Jan 2013
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07 Apr 2019, 23:54
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Hi Everyone,
Could anyone please guide on the usage of the below formula?
\(P(A or B) = P(A) + P(B) - P(A and B)\)
When is the formula applicable? and any particular question in GMAT prep?
Bunuel chetan2u
Could anyone please guide on the usage of the below formula?
\(P(A or B) = P(A) + P(B) - P(A and B)\)
When is the formula applicable? and any particular question in GMAT prep?
Bunuel chetan2u
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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08 Apr 2019, 03:08
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saurabh9gupta
Hi Saurabh,
This formula is called "Addition rule for not mutually exclusive events"
For example;
Selecting a perfect cube or an even number.
In this case, there will be n number of perfect cubes that are also even.
If I want to calculate the probability of perfect cubes or even numbers from 1 to 50 inclusive.
Total outcomes = 50.
Required outcomes : Perfect cubes = 1, 8, 27
Even numbers = 2, 4, 6, 8.....50 (Total = 25)
Required probability:
P(A or B) = P(A) + P(B) - P(A & B)
= 3(perfect cubes) + 25(even numbers) - 1(only one number is even & perfect cube = 8)
= 27
So 27/50
Hope this helps
11 Apr 2019, 03:34
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saurabh9gupta
Hey!
This formula is pretty much applicable throughout all domains of probability. The important part is getting P(A), P(B), P(A or B) and P(A and B) right.
These can be easily visualised by seeing some Venn Diagrams. If you ever have issues in probability, just draw these diagrams for the events and you will be able to visualise better.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
