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Let A = {x ∈ : [x + 3] + [x + 4] ≤ 3}, B = ⎪ ⎭ ⎪ ⎬ ⎫ ⎪ ⎩ ⎪ ⎨ ⎧ < ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ∈ − − ∞ = ∑ x 3 3 x 1 r r x 3 10 3 3 : R x , where [f] denotes greatest integer function. Then,

1. B ⊂ C, A ≠ B
2. A ∩ B = φ
3. A ⊂ B, A ≠ Β
4. A = B

Correct answer: A = B

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