Răspuns: 48 numere
Explicație pas cu pas:
Numerele de 3 cifre distincte cu toate cifrele pare sunt: 204,206,208,240,246,248,260,264,268,280,284,286,402,406,408,420,426,428,460,462,468,480,482,486,602,604,608,620,624,628,640,642,648,680,682,684,802,804,806,820,824,826,840,842,846,860,862,864.