There are 130 black and red balls in a pot. If 30 are black, how many black balls will you need to add to the box to increase picking a black to 0,5?
In a system the probability that each individual component of type A will fail is 0.05, type B is 0.04 and type C is 0.01. Components A, B and C are independent. a. Calculate the overall probability that each system will work b. Is there any difference in the probability of these systems, why?