The sum of all 4 digit numbers containing the digis 2, 5, 6, 8 without repetitions is

  The 4!=24 permutations of the four digits and consider their sum.2468 2486 2648 2684 2846 28648246 8264 8426 8462 8624 +8642We find that each column has: six 2's, six 4's, six 6's, six 8's.The total of each column is 6*2 + 6*4 + 6*6 + 6*8 = 120Hence, the addition has the form:000120 001200 012000

+120000

133320