GRE Prep 2023 For Dummies with Online Practice by Ron Woldoff

Author:Ron Woldoff [Woldoff, Ron]
Language: eng
Format: epub
ISBN: 9781119886624
Publisher: Wiley
Published: 2022-05-23T00:00:00+00:00

where C is the number of combinations you’re trying to determine, n is the total number of objects or events, and r is the number of objects or events you’re choosing. (As with the Permutations formula, the n near the C is not an exponent: It’s an indicator.)

From a group of ten colleagues, Sally must choose three to serve on a committee. How many possible combinations does she have to choose from?

Because the order doesn’t matter, this is a combination problem, so proceed as follows:

Joe buys a lottery ticket, picking two numbers out of 200. If the same number cannot be used twice and the order doesn’t matter, what is the probability that his two numbers will match the two winning lottery numbers?

Here, Joe is choosing 2 out of 200, and the order doesn’t matter, so first use the combinations formula to determine the total possible two-number combinations:

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