It's a computation. It would be 8!/3!(8-3)! If my memory serves me correctly.
I see 2/3 and 1/2 being multiplied
The answer is c alternate exterior angles
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Below is the solution:
<span>E(X) = 50*1 - 3*8000/10000
E(X) = 50 - 24 = $26 per year</span>
