Convert the binary value 100011 (base 2) into its octal (base 8) representation. What is the correct octal result?

Difficulty: Easy

Correct Answer: 43 (base 8)

Explanation:


Introduction / Context:
Binary-to-octal conversion is efficient because 1 octal digit maps exactly to 3 binary bits. Group the binary number into triples starting from the right (least significant bit), then translate each group to an octal digit.


Given Data / Assumptions:

  • Binary value: 100011₂.
  • We will group bits in sets of three from the right.
  • No fractional parts; integer conversion only.


Concept / Approach:
Write 100011₂ as grouped triples: 100 011. Convert each triple to octal: 100₂ = 4₈ and 011₂ = 3₈. Concatenate digits to obtain the octal number 43₈.


Step-by-Step Solution:

Group bits: 100011 → 100 011. Translate: 100₂ → 4; 011₂ → 3. Combine: result = 43₈.


Verification / Alternative check:
Decimal cross-check: 100011₂ = 32 + 2 + 1 = 35; 43₈ = 4*8 + 3 = 32 + 3 = 35. Both paths yield 35, so the conversion is correct.


Why Other Options Are Wrong:

47₈ = 39₁₀; 49₈ is not valid (octal digits 0–7 only); 50₈ = 40₁₀. “None” is invalid because 43₈ is correct.


Common Pitfalls:
Failing to pad leftmost bits to a full group of three; using invalid octal digits (8 or 9).


Final Answer:
43 (base 8)

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