You have 10 positive integers that each have d digits. What is minimum number of digits the sum will have in terms of d?

Question

If
abcde=1 (where a,b,c,d and e are all positive real numbers)
then
what is the minimum value of a+b+c+d+e?

Answer 1

If d=2, Then minimum Sum is possible only when 10 is added 10 times
ie., sum = 10×10 = 100. Therefore number of digits of the smallest sum for d=2 in terms of d is (d + 1).

Answer 2

The answer is d + 1