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Which of these is a valid binary number?

easy🧠 Conceptual Q2 of Q15
Intro to Computing - How Data is Represented
Which of these is a valid binary number?
A2A01
B11012
C123
D1010
Step-by-Step Solution
Solution:

  1. Step 1: Check each option for allowed digits

    Binary numbers only contain 0 and 1 digits.

  2. Step 2: Validate each option

    11012 has digit '2', 123 has digits '2' and '3', 2A01 has letters 'A' and '2'. Only 1010 contains only 0s and 1s.

  3. Final Answer:

    1010 -> Option D

  4. Quick Check:

    Valid binary number contains only 0 and 1 [OK]
Quick Trick: Binary digits are only 0 and 1, no other digits allowed [OK]
Common Mistakes:
MISTAKES
  • Including digits like 2 or letters
  • Confusing binary with decimal or hexadecimal

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