2. Now make the greatest and the smallest 4-digit numbers by using any one digit twice.
(a) 3, 8, 7
(b) 9, 0, 5
(c) 0, 4, 9
(d) 8, 5, 1
(a) 3, 8, 7
8873 is the greatest while 3387 is the smallest
(b) 9, 0, 5
9950 is the greatest while 5009 is the smallest
(c) 0, 4, 9
9940 is the greatest while 4009 is the smallest
(d) 8, 5, 1
8851 is the greatest while 1158 is the smallest