Answer:
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Step-by-step explanation:
176 10cent per 1 message
Let's begin by listing out the information given to us:
There are four students: n = 4
Number of students to be selected: r = 2
To calculate the combination of 2 students to be chosen, we use:

Therefore, there 12 possible combinations from these
Fractions are basically divisions.
Ex. 2/4 = 1/2
And whole numbers like 10, get greater when raised to an exponent.
Ex. 10^2 = 100