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!)
e. 1111 (3 + 4 + 5 + 7) (3!)
(need explanation pls)

• option e and the formula is here number og digits=4;
  given digits also=4;
  sum of four digits without repetition for any this kind of problem is=(1 1 1 ...n times)*(given digits sum)*(n-1)!
• 6 years agoHelpfull: Yes(0) No(0)