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WAEC 2021 · Paper 1 · Q2

Simplify (11two)2(11_{\text{two}})^2.

Worked solution (try it first)
  1. Change to base ten: 11two=2+1=311_{\text{two}} = 2 + 1 = 3.
  2. Square it: 32=93^2 = 9.
  3. Change back: 9=8+19 = 8 + 1, so the answer is 100121001_2, option A.

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