First slide

Combinations

Question

The sum of all five digit number that can be formed using the digits 1,2,3,4,5, when repetition of digits is not allowed, is

Difficult

A

366000
B

660000
C

360000
D

3999960

Solution

The sum of all five digit numbers $= (1 + 2 + 3 + 4 + 5) 24 (11111) = 3999960$

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