## Elementary Technical Mathematics

$\dfrac{1}{3}$
Multiply the numerators together and the denominators together. Note that the peoduct f two negative numbers is positive, $\require{cancel} =\dfrac{2 \times 1}{3 \times 2} \\=\dfrac{2}{6} \\=\dfrac{\cancel{2}}{\cancel{6}^3} \\=\dfrac{1}{3}$