Probability is difficult, higher mathematics inside the function segmentation, definite integral, indefinite product level and its set of functional properties, number of summation, dual integral, and even their definition of the derivative of the microelement as well as linear algebra are used, if linear algebra is the thirteenth chapter of higher mathematics (reportedly once the textbook so engaged in), then the probability of the previous subject is the application of the ~ ~ ~ so belongs to the more difficult and computationally intensive ~ ~ Engineering, the Economics, life in probability and mathematical statistics (computer virtual intelligence processing to be used in the last chapter of the Markov chain) five does not involve. Life in the high number of direct use of drops or not much, high number of just the foundation of the foundation ~