If we're doing 4000 follicles of hair transplantation, will all the 4000 follicles grow 100% without any fail? (Photo)

Nothing is 100% in life (aside from death and taxes).  Every case and every clinic (doctor) have varying success rates.  In general 90% + growth rate would be considered a success.  

Thank you for your question, depending on the location on where the hair follicles are placed will depend the survival., however typically 70-90%.  All The Best 

Generally a transplant would be pretty close to 100% survival, but it almost never hits the perfect survival mark, and a surgeon definitely couldn't guarantee that it would be 100% either. Even if only 90% survive, that's still a lot of grafts and it'll probably look just fine once you see the final results after a full year.