According to propositional logic, which of the following is NOT a proposition?

A function where each element in the codomain is mapped to by at most one element in the domain is called:

Let Q(x,y) be "x + y = 0" with domain as real numbers. Which of the following is false?

Which number serves as a counterexample to the statement "Every positive integer is the sum of three squares"?

In the proof that √2 is irrational, what is the initial assumption that leads to a contradiction?

Which of the following is logically equivalent to the inverse of p → q?

If A = {a, b} and B = {1, 2}, how many ordered pairs are in A × B?

What is the contrapositive of the statement "If 3n + 2 is odd, then n is odd"?

Let P(x) denote "x > 0" and the domain be all integers. What is the truth value of ∀x P(x)?

Given the premise "All students must take exams," which rule of inference allows us to conclude "John must take exams" if John is a student?