PCEP Practice Question: Data Types, Variables, Basic I/O and Operators
A developer needs to check if a variable x is between 10 and 20 (inclusive). Which expression is correct?
⚠ Common exam trap
Watch out — candidates often confuse inclusive vs. exclusive boundaries and select Option A with strict inequalities, or they misunderstand that `or` (Option D) creates a condition that is always true, failing to recognize the need for `and` logic.
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
✓
10 <= x <= 20
Python supports chained comparison operators, allowing `10 <= x <= 20` to evaluate whether `x` is between 10 and 20 inclusive. This expression is equivalent to `(10 <= x) and (x <= 20)`, which checks both boundaries simultaneously.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
x > 10 and x < 20
Why it's wrong here
Excludes the boundaries.
- ✗
x < 10 and x < 20
Why it's wrong here
This is equivalent to x < 10, not the range.
- ✓
10 <= x <= 20
Why this is correct
Chained comparison works exactly as desired.
- ✗
x >= 10 or x <= 20
Why it's wrong here
This is always true for any x.
Go deeper
Related to this question
About these practice questions
Courseiva writes every PCEP question from scratch — 498 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCEP practice question is part of Courseiva's free Python Institute 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 PCEP exam.