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2) 4 * 5

3) 6 / 2

4) 8 - 1

Final answer:The mathematical expression that is equivalent to a sum in the provided choices is '2 + 3'. This is the only addition operation among the options, which correctly represents a sum, fulfilling the question's requirement.Explanation:The question is asking us to select the mathematical expression that is equivalent to a sum. A sum refers to the result of adding two or more numbers. Looking at the given options:2 + 3 is a sum.4 * 5 is a product (result of multiplication).6 / 2 is a quotient (result of division).8 - 1 is a difference (result of subtraction).Therefore, the mathematical expression that represents a sum is 2 + 3.In solving similar problems, it is important to understand the different operations represented in the expressions: addition, multiplication, division, and subtraction. The addition of two positive numbers will always have a positive result, as noted in the reference that when two positive numbers add, the answer has a positive sign. Understanding how to work with whole numbers in addition and subtraction is fundamental in mathematics and helps us make more informed decisions about which mathematical expression to select....

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