C is the rigth answer because all the other three has two x values in common. :)
Answer:
Step-by-step explanation:
Answer:
three hundred and eight five twenty sevenths
Using the combination formula, it is found that Julia can take 15 combinations.
<h3>What is the combination formula?</h3>
is the number of different combinations of x objects from a set of n elements, given by:
![C_{n,x} = \frac{n!}{x!(n-x)!}](https://tex.z-dn.net/?f=C_%7Bn%2Cx%7D%20%3D%20%5Cfrac%7Bn%21%7D%7Bx%21%28n-x%29%21%7D)
For this problem, 4 students are taken from a set of 6, hence the number of combinations is given as follows:
![C_{6,4} = \frac{6!}{4!2!} = 15](https://tex.z-dn.net/?f=C_%7B6%2C4%7D%20%3D%20%5Cfrac%7B6%21%7D%7B4%212%21%7D%20%3D%2015)
More can be learned about the combination formula at brainly.com/question/25821700
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