Q73. A function f: ℝ → ℝ is defined such that f(x) = 1 if x is a rational number (x ∈ ℚ), and f(x) = -1 if x is an irrational number (x ∉ ℚ). What is the value of f(π) - f(22/7)?Mathematics — Functions And Limits — Question 73 of 77A. 0B. 2C. -2D. None of thesePractice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →