Solve if you can!!
Probability
Level
3
What is the sum of all possible numbers formed by 1,2,3,4,5?
3999960
5999880
9996600
5615615
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1 solution
Here , ( 5! ) combination . So, there are 120 number all most. If we write one number under one then every column '5' has 24 time , '4' has 24 time , '3' column has 24 time , '2' has 24 time , '1' has 24 time. So, ( 24 * 5 ) + ( 24 * 4 ) + ( 24 * 3 ) + ( 24 * 2 ) + ( 24 * 1 ) = 360
Bellow , here are 5 column . Addition of every column is 360 . Now , by general adding system you can get answer.
12345
21345
54321
.............
.............
45321
~~~~~~~~~~~~~
3999960
[ For example , 47 +34 ===== 8 1 Here 2nd column addition is 11. and 1st column addition is 7 ]