Question Number 35789 by ajfour last updated on 23/May/18
Commented by ajfour last updated on 23/May/18
$${How}\:{many}\:{skew}\:{pair}\:{of}\:{lines} \\ $$$${are}\:{there}\:\left({when}\:{a}\:{line}\:{is}\:{drawn}\right. \\ $$$${by}\:{joining}\:{any}\:{two}\:{vertices} \\ $$$$\left.{of}\:{the}\:{cube}\right)\:? \\ $$