Let a = {- 1, 0, 3}, B = {a + 2, A2-1}, a ∩ B = {3}, then the value of real number a is______ ．

∩ a = {- 1, 0, 3}, B = {a + 2, A2-1}, a ∩ B = {3}, ∩ 3 ∈ a, 3 ∈ B, ∩ a + 2 = 3 or A2-1 = 3, the solution is: a = 1 or 2 or - 2, by testing, a = 1 and - 2 do not mean the problem, rounding off, then the value of real number a is 2. So the answer is: 2

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