Question

determinati+multimea: B={x|x+apartine+N+si+13+<+x+;a+puterea+2+-+1+mai+mic+sau+egal90+}

Answer 1

x = ( 0, 1, 2, 3, 4, ...., 12  )
a = 1, 2, 3, 4, 5, 6, 7, 8, 9, 
B = ( 0, 1, 2, 3, 4, 5, ............., 12 )

( Sper ca este bine . )