Question

If A = {(x; y) : y = e^-x,x∈ℝ} and B = {(x; y) : y = e^-x; x ∈ℝ} then n(A∩B) is


(1) Infinity
(2) 0
(3)1
(4)2

Answer 1

Infinity that is option 1

Answer 2

Option 3 is correct answer of this question....

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