\[ \begin{array} {r c r c l }
1 &\times & 1 & = &1 \\
11 & \times& 11 & = &121 \\

111 & \times& 111 & =& 12321 \\

1111 & \times& 1111 & =& 1234321 \\
\end{array} \]

Observe the equations above.

Hence, what is the value of

\[ \underbrace{1111111111}_{10 \text{ 1's } } \times \underbrace{1111111111}_{10 \text{ 1's } } \; ?\]

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