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

This will depend greatly on the skill of your surgeon and his surgical team. In the right hands a 4,000 graft procedure should yield in the high 90% range. 

If the grafts are good (meaning they are intact with bulbs attached and have been kept in cool holding solution and not dried out) and are planted well (placed gently into the sites with minimal trauma) you should expect the great majority of your grafts to grow, >90%. The factors that I mentioned above, if not done properly leads to less survival of grafts.