Correct. Substitute $\displaystyle{g{=}}{6}\usepackage{cmbright}\Huge\$ into the formula $\displaystyle{P}={{2}}^{{6}}.\usepackage{cmbright}\Huge\$

Evaluate $\displaystyle{{2}}^{{6}}\usepackage{cmbright}\Huge\$ to find P, the number of people from whom Jack descends.

$\displaystyle{P}={64}\usepackage{cmbright}\Huge\$