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# ISTQB Exam ISTQB-CTFL Topic 5 Question 19 Discussion

Actual exam question for ISTQB's ISTQB-Foundation Level Exam exam
Question #: 19
Topic #: 5
[All ISTQB-Foundation Level Exam Questions]

Which or the following is a valid collection of equivalence classes for the following problem: An integer field shall contain values from and including 1 to and including 15.

Equivalence partitioning is a black-box test design technique where inputs to the software or system are divided into groups that are expected to exhibit similar behavior. For an integer field that should accept values from 1 to 15, the valid equivalence class is 1 through 15. The invalid equivalence classes are numbers less than 1 and numbers more than 15. Therefore, option D, 'Less than 1, 1 through 15, more than 15,' correctly identifies the valid equivalence class along with the two invalid classes, covering all possible input scenarios for the field. Options A, B, and C either do not accurately capture the valid range or incorrectly specify the range boundaries.

## Contribute your Thoughts:

That’s a good point. C seems logically complete.
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I agree. Options A, B, and D have odd ranges, like 'Less than 1.1'.
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Well, it clearly covers negative numbers, the range 1 to 15, and numbers above 15.
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Why do you think C is correct?
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Yeah, quite tricky. I think answer C makes the most sense.
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Interesting question in the exam, don't you think?
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