Question

plz ans this
urgently​

Answer 1

$\frac{1}{7} - \frac{1}{8} = 7 - 8 = - 1 \\ \\ \frac{1}{3} - \frac{1}{4} = \frac{1}{12} \\ \\ \\ - 1 - \frac{1}{12} = \frac{ - 13}{12}$