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All you need to do is to plug in both a and an and see which one is equal.

yeah, but what is the equation?

12 - 4 = 8
28 - 12 = 16
60 - 28 = 32
Why are the third and fourth choices equal?

You find which one is the right one by trying every equation till you get both sides equal.

Are some n's and (n-1)'s subscripts and exponents?

I'm still a lot confused on what the heck to do...

@mathstudent55 What do I subtract 60 by?

Grr.. Im so confused!! :/

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oops, sorry about that. :/