1.

The value of \[\left( \begin{matrix} 30\\ 0\\\end{matrix} \right)\left( \begin{matrix} 30\\ 10\\\end{matrix} \right)-\left( \begin{matrix} 30\\ 1\\\end{matrix} \right)\left( \begin{matrix} 30\\ 11\\\end{matrix} \right)+\left( \begin{matrix} 30\\ 2\\\end{matrix} \right)\left( \begin{matrix} 30\\ 12\\\end{matrix} \right)+......+\left( \begin{matrix} 30\\ 20\\\end{matrix} \right)\left( \begin{matrix} 30\\ 30\\\end{matrix} \right)\][IIT Screening 2005]

A. \[^{60}{{C}_{20}}\]
B. \[^{30}{{C}_{10}}\]
C. \[^{60}{{C}_{30}}\]
D. \[^{40}{{C}_{30}}\]
Answer» C. \[^{60}{{C}_{30}}\]


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