With the notation of question 28, deduce that $$\mathbb { P } \left( M \in \mathcal { G } \ell _ { n } ( \mathbb { R } ) \right) \geqslant \frac { 1 } { 2 ^ { n - 1 } } .$$
With the notation of question 28, deduce that
$$\mathbb { P } \left( M \in \mathcal { G } \ell _ { n } ( \mathbb { R } ) \right) \geqslant \frac { 1 } { 2 ^ { n - 1 } } .$$