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Sidney is building a first-aid kit. There are $2$ kinds of bandages and $2$ disinfectants to choose from. How many different first-aid kits can Sidney make using exactly one of each item? $\newline$ _____ first-aid kits

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Counting principle

Full solution

Q. Sidney is building a first-aid kit. There are

2

kinds of bandages and

2

disinfectants to choose from. How many different first-aid kits can Sidney make using exactly one of each item?

\newline

_____ first-aid kits

Identify Choices: Identify the number of choices for each item in the first-aid kit. $\newline$ Sidney has $2$ choices of bandages and $2$ choices of disinfectants.
Use Counting Principle: Use the fundamental counting principle to determine the total number of different first-aid kits. The number of different first-aid kits is the product of the number of choices for each item. Number of different first-aid kits $= \text{Number of bandage choices} \times \text{Number of disinfectant choices}$
Calculate Total Kits: Calculate the number of different first-aid kits. $\newline$ Number of different first-aid kits = $2$ (bandages) $\times$ $2$ (disinfectants) = $4$

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