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Evaluate(111two)\(^2\) and leave your answer in base 2.

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Mathematics WAEC 2007

Evaluate(111two)\(^2\) and leave your answer in base 2.

  • 111001two
  • 110001two checkmark
  • 101001two
  • 10010two

The correct answer is: B

Explanation

(111two)\(^2\) change to base 10 

(111two)\(^2\) = 1 x 2\(^2\) + 1 x 2\(^1\) + 1 x 2\(^0\) = 4 + 2 + 1 = 7

(111two)\(^2\) = 7\(^2\) = 49 in base 10 

convert 49 in base 10 to base 2

2 49
2 24 R 1
2 12 R 0
2 6 R 0
2 3 R 0
2 1 R 1
2 0 R 1

Therefore (111two)\(^2\) = 110001\(_2\)

Or solve by direct multiplication.

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