Latest Self Aptitude Question SOLUTION: The sum of all four-digit numbers without repetition using 3, 4, 5, 7 is ... . a. 1111 (3! + 4! + 5! + 7!) b. 1111 (3 + 4 + 5 + 7) c. 4444 (3 + 4 + 5 + 7) d. 5555 (3! + 4! + 5! + 7