Five numbers for 120 4-digit numbers

Level 2

There are 120 120 four digit numbers that contain only the digits 1 , 2 , 3 , 4 , 5 1,2,3,4,5 , each at most once. Find the sum of all such numbers.


The answer is 399960.

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1 solution

Kis Toper
Oct 5, 2015

S=60(1234+5432) S=399960

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