Question

Assume grade is an int variable. Which of the following is equivalent to !(grade < 90)?
Group of answer choices

!grade >= !90

grade > 90

grade <= 90

grade >= 90

!grade > !90

Answer 1

To find the expression that is equivalent to `!(grade < 90)`, we need to analyze the logical meaning behind the expression.

The expression `!(grade < 90)` means "it is NOT true that grade is less than 90." This can be rewritten using the rules of logic:

1. If `grade < 90` is false, it implies that grade is *not* less than 90. Therefore, the only other possibilities for `grade` are:
- It is equal to 90, or
- It is greater than 90.

This translates into the logical expression:

- `grade >= 90`

So, the expression that is equivalent to `!(grade < 90)` is:

**grade >= 90**

Thus, the correct choice from the options provided is:

**grade >= 90**