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Question
Math
Posted 10 months ago

Manny's burrito stand lets customers choose 4 ingredients from the list below to add their burritos:
\begin{tabular}{|c|c|c|c|}
\hline Onions & Cilantro & Jalapeño & Beans \\
\hline Cheese & Crema & Salsa & Hot sauce \\
\hline
\end{tabular}

How many groups of 4 different ingredients can go on a burrito?
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Answer from Sia
Posted 10 months ago
Solution by Steps
step 1
To determine the number of different groups of 4 ingredients that can be chosen from 8 ingredients, we use the binomial coefficient
step 2
The binomial coefficient formula is (nk)=n!k!(nk)!\binom{n}{k} = \frac{n!}{k!(n-k)!}, where nn is the total number of items, and kk is the number of items to choose
step 3
Applying the formula with n=8n=8 and k=4k=4, we get (84)=8!4!(84)!\binom{8}{4} = \frac{8!}{4!(8-4)!}
step 4
Simplifying the expression, we have (84)=8!4!4!=8×7×6×54×3×2×1\binom{8}{4} = \frac{8!}{4!4!} = \frac{8 \times 7 \times 6 \times 5}{4 \times 3 \times 2 \times 1}
step 5
Calculating the simplified expression gives us (84)=70\binom{8}{4} = 70
Answer
There are 70 different groups of 4 ingredients that can go on a burrito.
Key Concept
Combinations and the Binomial Coefficient
Explanation
The number of ways to choose kk items from a set of nn distinct items is given by the binomial coefficient (nk)\binom{n}{k}, which is calculated using the formula (nk)=n!k!(nk)!\binom{n}{k} = \frac{n!}{k!(n-k)!}. This represents the number of combinations possible without regard to order.

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