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a fost răspuns

c={x apartineN/x+2 apartineD28}

Răspuns :

Elyelenawow
D₂₈={1,2,4,7,14,28}
1+2=3
2+2=4
4+2=6
7+2=9
14+2=16
28+2=30
C={3,4,6,9,16,30}