Assume you have three input variables x1, x2, and x3. The valid input value spaces of each of x1, x2, and x3 are split into 3 equivalence classes. What is the minimum set of test cases (input side) to cover all possible combinations of valid input equivalence classes? 3 9  81 27 I'm guessing the answer is 27, but I'm not sure. Can someone explain how such questions are answered and what is the correct answer?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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  1. Assume you have three input variables x1, x2, and x3. The valid input value spaces of each of x1, x2, and x3 are split into 3 equivalence classes. What is the minimum set of test cases (input side) to cover all possible combinations of valid input equivalence classes?
  1. 3
  2. 81
  3. 27

I'm guessing the answer is 27, but I'm not sure. Can someone explain how such questions are answered and what is the correct answer?

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