600-700 digits problem

Hi rtaha2412,

I think your Q is not properly formatted so its does not seem clear. However I think below is the proper Question.

What is the least number of digits (including repetitions) needed to express 10^100 in decimal notation?

As per Interpretation, try to visualize what has been asked. The question is asking total number of digits when 10^100 will have.

See 10^1 = 10 have 2 digits
10^2 = 100 have 3 digits
10^3 = 1000 have 4 digits.....

So in general 10^n has (n+1) integer.

So put n=100 then (n+1) = 101

IMO C