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Probability concept

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by Syleena » Mon Sep 12, 2011 1:54 am
Hello, everyone!

I am about to take the GMAT in a month. Today I surfed the site for some useful articles and videos about probability, since it appears to be a problem for me. Could someone clarify a little more the concept about the coin, explained in this article : https://www.beatthegmat.com/mba/2010/07/ ... 101-part-2, particularly the formula: "total possible events = number of possible outcomes raised by the number of times the event occurs". I get the exapmple with the coin, but I am afraid I can't put it to work myself in another problem.
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Source: — Quantitative Reasoning |
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by VivianKerr » Thu Sep 29, 2011 6:50 am
Let's say we roll a dice 4 times.

The Number of Possible Outcomes is 6, since a regular die has six sides.
The Number of Times the Even Occurs is 4.

For the first roll we have six options: 1, 2, 3, 4, 5, 6.
For the second roll we have six options: 1, 2, 3, 4, 5, 6.
For the third roll we have six options: etc.
For the fourth roll we have six options: etc.

To find how many total possible events, we will multiply 6 x 6 x 6 x 6 = 6^4.
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