Question

Determinati multimile:

B={xIx ∈ IN* si x+1 ∈ D }
18

Answer 1

x+1=1,2,3,9,6,18
x+1=1 ⇒x==0
x+1=2        x=1
x+1=3  rezulta ca x=2
x+1=6⇒x=5
x+1=9⇒x=8
x+1=18⇒x=17
  B= [0 2  1       5    8        17]