Question

Given that a 4 digit no. N and the sum of the digit of N have a sum 2001. Find N

Answer 1

Answer:

Four digit numbers =4⋅3⋅2⋅1=24 ways we can form a four digit number. Since it's a 4 digit number, each digit will appear 6=24/4 times in each of units, tens, hundreds, and thousands place. Therefore, the sum of digits in the units place is 6(1+2+5+6)=84.