FC0-U71 Tech Concepts and Terminology Practice Question
Which of the following is the decimal equivalent of the binary number 1101?
⚠ Common exam trap
FC0-U71 often tests binary conversion with answers that differ by a single bit — candidates who misalign place values or miscount bit positions land on 11, 14, or 10 instead of 13.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
13
Binary 1101 converts to decimal by summing the place values where bits are 1: (1×8) + (1×4) + (0×2) + (1×1) = 8 + 4 + 0 + 1 = 13. Therefore the decimal equivalent is 13.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
13
Why this is correct
Binary 1101 equals 1×8 + 1×4 + 0×2 + 1×1, which totals 13. Each position represents a power of two, so the set bits at 8, 4 and 1 sum to the decimal value 13.
- ✗
10
Why it's wrong here
Binary 1101 evaluates as 8+4+0+1, giving 13. The value 10 corresponds to binary 1010, so the bit weights have been misread. Decimal conversion is the correct approach here; the error lies in summing the wrong positional powers of two.
- ✗
14
Why it's wrong here
Binary 1101 evaluates as 8+4+0+1, giving 13. The value 14 corresponds to binary 1110, so the third bit has been counted as set when it is zero. Decimal conversion is correct; the error is misreading that middle bit.
- ✗
11
Why it's wrong here
Binary 1101 evaluates as 8+4+0+1, giving 13. The value 11 corresponds to binary 1011, so the least significant bits have been misread. Decimal conversion is the right method; the mistake is in the positional weighting of the final bits.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This FC0-U71 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the FC0-U71 exam.