WAEC Mathematics 2003 Question 27

Question 27

Number Bases

Evaluate (111two)2 − (101two)2

  1. A.10two
  2. B.100two
  3. C.1100two
  4. D.11000two
Show the answer and explanation

Answer: D (11000two)

Explanation

111two = 7 and 101two = 5. 49 − 25 = 24 = 11000two.