1. Simplify the expression \( \frac{16ab}{6ab^2} \).

Divide numerator and denominator by their common factors: \( \frac{16}{6} = \frac{8}{3} \), \( a \) cancels out, and \( b \) reduces to \( b^{-1} \). The result is \( \frac{8}{3b} \).