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Grade: 12th pass 

                        
If N is the sum of all digits used in writing all the numbers from 1 Tu thousand then the last digit of N is
3 years ago

Answers : (1)

Saurabh Koranglekar
askIITians Faculty
8407 Points 
							sum=
(1+1000)1000/2

0 last digit

it uses formula (a +An)*(n/2)
2 years ago
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