3) a) Calculati sumele :
2+4+6+...+2014 .
b) 2 la puterea 1 + 2² +2³ +..+2 la puterea 2014

4) Se considera multimile : A={x ∪ ℕ / 3 ≤ x +1 ≤ 7 }
B = { y ∈ ℕ / y = 2 la puterea x - 1 ; x ∈ A } ; C = { z ∈ ℕ / z = y - 3 ; y ∈ B } Determinati multimile : A , B, C ; A ∩ B ∩ C ; ( A ∪ B ) - C ; ( C -B ) ∪ A , A∪ B∪C
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