The probability of any event is equal to the ratio of the number of outcomes favorable to this event to the total number of all equally possible incompatible elementary outcomes forming a complete group.
In this problem, the event of interest to us is the choice of an unreflected light bulb.
Unframed bulbs 1000-5 = 995 – this is the number of favorable outcomes.
1000 is the number of all equally possible incompatible elementary outcomes.
P = 995/1000 = 0.995
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.