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$\left( \begin{matrix} n-1 \\ 1 \\\end{matrix} \right)+\left( \begin{matrix} n-1 \\ 2 \\\end{matrix} \right)+...+\left( \begin{matrix} n-1 \\ n-2 \\\end{matrix} \right)=.......$(જ્યાં$n>2$)

• A
  ${{2}^{n}}+2$
• B
  ${{2}^{n}}$
• ✓
  ${{2}^{n-1}}-2$
• D
  ${{2}^{n}}-1$