Question

the sum of all 4 digit number containing the digits 2,4,6,8 without repetition is
a.1,33,330. b.1,22,220.
c.2,13,330. d.1,33,320.​

Answer 1

Answer:

2468

2486

2648

2684

2846

2864

8246

8264

8426

8462

8624

+8642

We 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 = 120

Hence, the addition has the form:

000120

001200

012000

+120000

------------

133320

Therefore, the sum is: 133,320