Quick Answer
The answer is range(1,11) because the range function start stop parameters in Python define an inclusive start and an exclusive stop, meaning range(1,11) generates the integers 1 through 10. This directly matches the requirement to sum numbers from 1 to 10 without including zero. On the Certified Entry-Level Python Programmer PCEP exam, this concept tests your understanding of how range() works with its two arguments, and a common trap is forgetting that the stop value is never included—so range(1,10) would only sum 1 through 9. Another frequent pitfall is using range(0,11), which includes 0; while adding zero doesn’t change the sum, the question specifically asks for the range that avoids unnecessary values. To remember, think “start inclusive, stop exclusive” and picture the stop number as a closed door: you stop just before it. A handy mnemonic is “Start where you want, stop one beyond.”
This PCEP practice question tests your understanding of control flow, loops, lists and logic. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer writes a loop to sum numbers from 1 to 10. The code outputs 55, but the expected sum is 55. However, the loop uses a range that includes 0. Which range should be used to achieve the correct sum?
range(0,11)
Why wrong: Includes 0, which is unnecessary but still sums to 55; however the question says the loop includes 0 and that's not desired.
range(1,11)
Correctly generates 1..10
range(0,101)
Why wrong: Generates 0..100, sum 5050
range(1,10)
Why wrong: Generates 1..9, sum 45
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
range(1,11)
Option B (range(1,11)) is correct because range(start, stop) generates numbers from start inclusive to stop exclusive. To sum numbers 1 through 10, the range must start at 1 and end at 11 (so 10 is included). The loop that used range(0,11) included 0, but since adding 0 does not change the sum, the output was still 55 — however, the question asks for the range that achieves the correct sum without including unnecessary values.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
range(0,11)
Why it's wrong here
Includes 0, which is unnecessary but still sums to 55; however the question says the loop includes 0 and that's not desired.
range(1,11)
Why this is correct
Correctly generates 1..10
Related concept
Read the scenario before looking for a memorised answer.
range(0,101)
Why it's wrong here
Generates 0..100, sum 5050
range(1,10)
Why it's wrong here
Generates 1..9, sum 45
Common exam traps
Python Institute often tests the exclusive nature of range()'s stop parameter, tricking candidates into thinking range(1,10) includes 10 or that range(0,11) is equivalent to range(1,11) when the sum is unchanged by zero.
Detailed technical explanation
The range() function in Python creates an immutable sequence of integers. Its stop parameter is exclusive, meaning range(1,11) yields [1,2,3,4,5,6,7,8,9,10]. This off-by-one behavior is a common source of bugs; in real-world scenarios, such as pagination or slicing data, misusing the stop value can lead to missing or extra elements. The sum of the first n natural numbers is n*(n+1)/2, and for n=10 that equals 55, confirming the correct range.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PCEP exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Control Flow, Loops, Lists and Logic — This question tests Control Flow, Loops, Lists and Logic — Read the scenario before looking for a memorised answer..
The correct answer is: range(1,11) — Option B (range(1,11)) is correct because range(start, stop) generates numbers from start inclusive to stop exclusive. To sum numbers 1 through 10, the range must start at 1 and end at 11 (so 10 is included). The loop that used range(0,11) included 0, but since adding 0 does not change the sum, the output was still 55 — however, the question asks for the range that achieves the correct sum without including unnecessary values.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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