This question practices substitution into a fractional algebraic expression and simplification.
\( \text{Evaluate } \frac{ab - b^2}{a} \text{ when } a = 4,\ b = 2 \)
Choose one option:
Work out each part of the numerator first, then divide by the denominator. Check your arithmetic.
Compute numerator and denominator separately, then simplify the fraction carefully.
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