Question:
Find $\frac{1}{a-1}+\frac{1}{b-1},$ where $a$ and $b$ are the roots of the quadratic equation $2x^2-7x+2 = 0.$

Answer:
We use the fact that the sum and product of the roots of a quadratic equation $ax^2+bx+c = 0$ are given by $-b/a$ and $c/a,$ respectively. This means that $a+b = 7/2$ and $ab = 2/2 = 1.$ Now we manipulate the expression $\frac{1}{a-1}+\frac{1}{b-1}$ to get:  $$\frac{1}{a-1}+\frac{1}{b-1} = \frac{b-1}{(a-1)(b-1)} + \frac{a-1}{(a-1)(b-1)} = \frac{(a+b)-2}{(a-1)(b-1)}.$$ But the denominator $$(a-1)(b-1) = ab - a - b + 1 = (ab) - (a+b) + 1 = 1 - 7/2 + 1 = 2 - 7/2,$$ whereas the numerator $a+b-2 = 7/2 - 2.$

Thus, our answer is $\frac{7/2-2}{2-7/2} = \boxed{-1}.$