There are 4 numbers as 5,8,2,1 Form 4, four digit numbers as A, B and find the sum?

• 1,2 5, 8 - 4 numbers that can be arranged to form 4-digit number in 4! ways = 24 ways.
  
  For totalling If we place all the 4 digit numbers formed vertically one below each other
  eg
  1285
  2185
  8125
  2518
  Out of 24 such arrangements each number (A or B or C or D) repeats itself in a vertical column (eg tens place or units place) = 24/ 4 = 6 times
  so total of each column is (1 + 2 + 5 + 8) = 16
  so each total is repeated 6 times hence total of a vertical row = 16 * 6 = 96
  
  so total of all 4 digit numbers formed numbers is 96 (1+10+100+ 1000) = 96*(1111) = 106656
• 11 years agoHelpfull: Yes(7) No(2)