Suppose f is a function mapping ordered pairs from x₁ = [1,2,3] and [5,6] to Y = [4,5,6,7,8,9] and y = f(x₁,x₂) = x₁ + x₂ . Let A₁ and A₂ be fuzzy sets defined on x₁ and x₂ , respectively.
a) [5, 6, 7]
b) [6, 7, 8]
c) [1, 2, 3]
d) [4, 5, 6]