a) x∈{12 ; 24 ; 36 ; 48 ; 60 ; 72 ; 84 ; 96 } b) x∈{16 ; 32 ; 48 ; 64 ; 80 ; 96 } M ∩ N= { 48 ; 96 }

M12 <100:{0,12,24,36,48,60,72,84,96} x≠0 ⇒M={12,24,36,48......96} M16<100:{0,16,32,48,64,80,96} x≠0 ⇒ N={16,32,48,.....96} M∩N={48,96}