What will be the sum of adding all the possible four - digit numbers formed by 7, 9, 1, 3 using each of the digits only once?
 

Dear Student,

Please find below the solution to the asked query:

We can have four digit number from 7 , 9 , 1 and 3 are :

7913 , 7931 , 7391 , 7319 , 7139 , 7193

And

9713 , 9731 , 9371 , 9317 , 9137 , 9173

And

1973 , 1937 , 1397 , 1379 , 1739 , 1793

And

3917 , 3971 , 3791 , 3719 , 3179 , 3197

Then , Sum of all these numbers :

7913 + 7931 + 7391 + 7319 + 7139 + 7193 + 9713 + 9731 + 9371 + 9317 + 9137 + 9173 + 1973 + 1937 + 1397 + 1379 + 1739 + 1793 + 3917 + 3971 + 3791 + 3719 + 3179 + 3197  = 133320              ( Ans )


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