# 12.15: Combination Problems

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**Practice**Combination Problems

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combination

Combinations are distinct arrangements of a specified number of objects without regard to order of selection from a specified set.combination notation

Combination notation has the forms nCr and c(n, r) where n is the number of different units to choose from and r is the number of units in each group.combinatorics

Combinatorics is the study of permutations and combinations.n value

When calculating permutations with the TI calculator, the n value is the number of objects from which you are choosing.Permutation

A permutation is an arrangement of objects where order is important.permutation notation

Permutation notation is the form nPr or P(n, r), and indicates the number of ways that n objects can be ordered into groups of r items each.TI-84

The TI-84 calculator is a graphing calculator produced by Texas Instruments and is considered an “industry standard” for more advanced calculations.### Image Attributions

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Find out how to calculate combinations given different scenarios.

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Date Created:

Dec 21, 2012
Last Modified:

Sep 08, 2016
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