va rog ....dau 10 pct

A={n€N*|n<3}
B={n€N*|2^n<8}
A=B?
n€N* si n<3 => n = 1,2,3 =>
A={1,2,3}
n€N si 2^n<8 =>
2^1 = 2 < 8
2^2 = 4 < 8
2^3 = 8 < 8
2^4 = 16 > 8 =>
n = 1,2,3 =>
B={1,2,3}
=> A=B