High School

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Every morning, a deli offers a "commuter special" where customers can select a pastry, beverage, and a copy of one of the local papers for [tex]$\$1.00$[/tex]. Their options are listed in the table below.

[tex]\[
\begin{tabular}{|c|c|c|}
\hline
\multicolumn{3}{|c|}{Commuter Special} \\
\hline
Pastry & Beverage & Paper \\
\hline
Donut & Coffee & The Times \\
\hline
Brownie & Milk & The Herald \\
\hline
Muffin & Tea & \\
\hline
Scone & Orange Juice & \\
\hline
Croissant & & \\
\hline
\end{tabular}
\][/tex]

Last Tuesday, the deli did not have any muffins. How did that affect the number of possible combinations?

A. It decreased the number of combinations by 1.
B. It decreased the number of combinations by 4.
C. It decreased the number of combinations by 8.
D. It decreased the number of combinations by 10.

Answer :

We start by finding the total number of combinations when all items are available. There are:

- [tex]$5$[/tex] types of pastry,
- [tex]$4$[/tex] types of beverage,
- [tex]$2$[/tex] types of paper.

Thus, the original number of possible combinations is

[tex]$$
5 \times 4 \times 2 = 40.
$$[/tex]

Since the muffins are not available, the number of pastry options decreases by one, leaving us with

[tex]$$
5 - 1 = 4 \text{ pastries}.
$$[/tex]

With [tex]$4$[/tex] pastries, [tex]$4$[/tex] beverages, and [tex]$2$[/tex] papers, the new number of combinations is

[tex]$$
4 \times 4 \times 2 = 32.
$$[/tex]

The decrease in the number of combinations is the difference between the original and the new total:

[tex]$$
40 - 32 = 8.
$$[/tex]

So, the number of possible combinations decreased by [tex]$\boxed{8}$[/tex].

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Rewritten by : Jeany