Question on: WAEC Mathematics - 2001

Evaluate \((20_{three})^2 - (11_{three})^2\) in base three

A
101
B
121
C
202
D
2020
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Correct Option: C

\((20_{three})^2 - (11_{three})^2\)

= \((20_{3} - 11_{3})(20_{3} + 11_{3})\)

= \((2_{3})(101_{3})\)

= \(202_{3}\) 

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