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In the following situation, determine whether you are asked to determine the number of permutations or combinations. Then do the calculation.

How many ways are there to pick a starting five from a basketball team of twelve members?

A. Permutation; [tex]${ }_7 P_5=2520$[/tex]
B. Combination; [tex]${ }_{12} C _5=792$[/tex]
C. Combination; [tex][tex]${ }_1 C_5=2520$[/tex][/tex]
D. Permutation; [tex]$12 P_5=95040$[/tex]

Please select the best answer from the choices provided:

A
B
C
D


Sagot :

To solve this problem, it's essential to understand whether the problem requires the calculation of permutations or combinations. Here, we need to determine how many ways we can choose a starting five from a team of twelve members.

### Key Concepts:
1. Permutations: Used when the order of selection matters.
2. Combinations: Used when the order of selection does not matter.

In the context of picking a starting five for a basketball team, the order in which the players are picked does not matter; we are only interested in which players are chosen.

Therefore, we need to use combinations to solve this problem. The formula for combinations is given by:

[tex]\[ \binom{n}{r} = \frac{n!}{r!(n-r)!} \][/tex]

where:
- [tex]\( n \)[/tex] is the total number of items.
- [tex]\( r \)[/tex] is the number of items to choose.
- [tex]\( ! \)[/tex] denotes factorial, which is the product of all positive integers up to that number.

In this specific problem:
- [tex]\( n = 12 \)[/tex]: Total number of players.
- [tex]\( r = 5 \)[/tex]: Number of players to choose for the starting five.

Using the combination formula, we have:

[tex]\[ \binom{12}{5} = \frac{12!}{5!(12-5)!} \][/tex]

After calculating this formula, we find:

[tex]\[ \binom{12}{5} = 792 \][/tex]

Therefore, the number of ways to pick a starting five from a basketball team of twelve members is 792.

Hence, the best answer from the choices provided is:
b. Combination; [tex]\(\binom{12}{5} = 792\)[/tex]

And the correct selection is:
B