Let $n \in N$ and $[x]$ denote the greatest integer less than or equal to $x$. If the sum of ( $n+1$ ) terms ${ }^{\mathrm{n}} \mathrm{C}_0, 3 \cdot{ }^{\mathrm{n}} \mathrm{C}_1, 5 \cdot{ }^{\mathrm{n}} \mathrm{C}_2, 7 \cdot{ }^{\mathrm{n}} \mathrm{C}_3, \ldots \ldots$ is equal to $2^{100} \times 101$, then $2\left[\frac{\mathrm{n}-1}{2}\right]$ is equal to $\_\_\_\_$ .