Select a counter-example that makes the conclusion false.

7 - 3 = 4, 8 - 5 = 3, 9 - 8 = 1

conclusion: the difference of two positive numbers is always positive.

counterexample:

The statement is False.

For this, it is enough to show a case in which the subtraction of two positive numbers is negative.

For this, we must choose two numbers.

Suppose we want to subtract the following numbers:

Number 1: 5

Number 2: 10

Subtracting both numbers we have:

We observe that the result is negative. Therefore, the given conclusion is false.

Counterexample:

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed