4x=10
Divide ten by four and the answer will be equal to x.
Your answer is:
B. x<<span>−<span>10</span></span>
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