Excel in math, science, and engineering

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In base 2,

\[\begin{aligned}11\times11&=1001 \\ 111\times 111&=110001 \\ 1111\times 1111&=11100001\end{aligned}\]

What is \(11111\times 11111\)?

4 divides 100 in base 10. Does 4 divide 100 in base 11?

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