I am going through this lesson, in that there is the following statement
With 1M pastes every day we will have 3.6 billion Pastes in 10 years. We need to generate and store keys to uniquely identify these pastes. If we use base64 encoding ([A-Z, a-z, 0-9, ., -]) we would need six letters strings:
64^6 ~= 68.7 billion unique strings
My question is like how we are coming up with 64^6 calculation, I am not getting this math under the hood, I got the same doubt for the URL service lesson also, can anyone explain the math behind it, please?
Thanks in Advance