Question

which of the following are not a pair of reciprocals
$\frac{3}{8} . \frac{16}{6} \\ \frac{3}{8} .2 \times \frac{2}{3} \\ \\ 5. \frac{1}{5} \\ \\ \frac{7}{9} . \frac{21}{27}$

Answer 1

$\frac{3}{8} \frac{16}{6 } = \frac{2}{2}$