Ответ:

2) 63 = 3 * 3 * 7;

42 = 2 * 3 * 7;

168 = 2 * 2 * 2 * 3 * 7;

4) 42 = 2 * 3 * 7;

650 = 2 * 5 * 5 * 13;

260= 2 * 5 * 2 * 13;