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Eli is building a set of reference materials for his office. He can choose from $2$ dictionaries and $5$ thesauruses. Assuming he wants only one of each type of book, how many different sets of reference materials can Eli put together? $\newline$ $\newline$ _____ sets

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Counting principle

Full solution

Q. Eli is building a set of reference materials for his office. He can choose from

2

dictionaries and

5

thesauruses. Assuming he wants only one of each type of book, how many different sets of reference materials can Eli put together?

\newline

\newline

_____ sets

Count Choices: Step $1$ : Count the choices for dictionaries and thesauruses. Eli has $2$ dictionaries and $5$ thesauruses to choose from.
Apply Principle: Step $2$ : Apply the Basic Counting Principle. Multiply the number of choices for dictionaries by the number of choices for thesauruses to find the total number of different sets Eli can put together. Calculation: $2$ dictionaries $\times$ $5$ thesauruses $=$ $10$ sets.

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