How to learn high school probability Is probability difficult Can you do it if you don t learn it? L

Hehehe, the probability is not difficult, relatively simple, but if you don't learn, you won't! What can you learn if you don't learn! Unless you're supernatural!

Don't know how you feel about math? I'm not interested in it, I often fail in high school, but it's absolutely fine to learn probability, learn something simple, you have to believe in yourself, I'm stupid in math, I can learn it, you can definitely learn it well! But only if you study hard!

Fortunately, it's not difficult, the probability questions in the college entrance examination every year are basically points, but if you don't study, you will definitely not.

And to say that it is not difficult is not to say that the knowledge itself is not difficult, but to say that the topics are relatively easy.

The permutations and combinations in the probability chapter are quite interesting, but it's impossible not to learn them.

It's not very difficult, in fact, if you listen to the lecture carefully, you can find the probability by making more connections No matter how difficult the questions are in the future, they also have something in common, at first they are a few fractions of the course, and then the questions are particularly difficult, the key is that you have to be careful and practice more Probability is skillful.

The probability is not very difficult, but some of the questions are more abstract, and if you understand the meaning of some problems, you will almost be able to understand the formulas

This is the easiest part of high school math.

Learning permutations and combinations is like playing.

If it's a big question, 1 small question is simple, and generally what counter-proof method will be solved, such as asking you that x event is greater than or equal to 2, you ask him for the probability that it is less than or equal to one, and then subtract it is OK.

2 questions are generally related to one question Note that it is general and there are 2 terms of distribution It's very simple.

Something from a few years ago, long forgotten!

The methods of finding probability in high school mathematics are summarized as follows:

The probability formula is as follows:

1. Classical generalization: p(a)=the number of basic events contained in a Total number of basic events = m n.

If a randomized trial contains a finite number of unit events, and each unit of event has an equal probability of occurring, then the randomized trial is called the Laplace test, and the probability model under this condition is called the classical generalization.

2. Geometric generalization: p(a) = the length of the region constituted by all the results of the Changminqing travel test constituting event a.

If the probability of each event occurring is proportional only to the length (area or volume or degree) that makes up the area of the event, then such a probability model is called a geometric probabilistic model, or geometric generalization for short.

3. Conditional probability: p(a|b)=nab nb=p(ab) p(b)=ab, the number of basic events contained in b the number of basic events contained in b.

Conditional probability refers to the probability that event A will occur under the condition that event B occurs. The conditional probability is expressed as: p(a|b), read as "the probability that a will occur under the condition that b occurs".

If there are only two events a,b,,p(a|b）=p（ab）/p（b）。

In the formula, p(ab) is the joint probability of the event ab, and p(a|b) is the conditional probability, which represents the probability of a under condition b, and p(b) is the probability of event b.

4. Benuli generalization: pn(k)=cn*p k.

Benulrie generalization It is a probabilistic model based on independent repeated experiments that satisfies the binomial distribution, and its basic characteristics:

One test was repeated under a set of fixed bridge stools.

There are only two outcomes for each trial: event occurrence or non-occurrence.

The probability of the same event occurring is the same in each trial.

The results of each replicate test are independent of each other.

Please click Enter a description.

Introduction to Probability: Also known as probability, chance or probability, probability, is the basic concept of mathematical probability theory, which is a real number between 0 and 1, and is a measure of the probability of random events occurring. The number that represents the probability of an event occurring is called the probability of the event.

It is a measure of the likelihood of a random event occurring, and it is also one of the most basic concepts of probability theory.

It is often said that there is a percentage certainty that someone will pass the test and what is the probability that something will happen, these are examples of probability. However, if the probability of an event occurring is 1 n, it does not mean that one of the n events must occur, but that the frequency of the occurrence of this event is close to the value of 1 n.

High school probabilities are mainly of classical generalizations and geometric generalizations.

Classical generalizations, pay attention to whether the various situations are equal to the possibility, you can list all the situations after a number, you can also use the method of calculation, the classical generalization is not too difficult to stop.

Geometric generalization is mainly a question of filial piety and repentance of ideas. It is necessary to pay attention to other possible situations, and at the same time, it may be necessary to use the coordinate graph operation. In this regard, Qiaoheng is touching on some topics and opening up his own ideas.

Good luck. Practice more math.

1. 1 2 2 3 3 4x get x, i.e. at least 4 shots.

Second, there are a total of 6 6 6 = 216 kinds of forms, in fact, it is equivalent to 3 dice rolled together, if the first time is 1, then there are 10 kinds of followers, if the first time is 2, then there are 5 kinds later, if the first time is 3, then there are 3 kinds later, if the first time is 4, then there is only 1 kind of total, 10 + 5 + 3 + 1 = 19 kinds, then this probability is 19 216 Third, the probability of rolling an even number is (2 + 4 + 6) (1 + 2 + 3 + 4 + 5 + 6) = 12 21 The probability of rolling a prime number is (1+2+3+5) (1+2+3+4+5+6)=11 21 Then the intersection is 11 21 and the union is 12 21

It is difficult to directly ask for 6 people from different classes, which can be considered from the opposite side. Choose 6 people as the main force = choose 4 people as the main force. If the main 6 people are from different classes, then at least 1 of the non-main 4 people is from class (5) and 1 person is from class (8).

10 candidates, 4 people, the total possible number is 10c4, 1 person is from class (5), 1 person is from class (8), the possible number is (2c1), (2c1), (6c2); 2 people from class (5) or (8) and 1 person from the other person, possibly counting 2· (2c2) (2c1) (6c1)； All 4 people are from classes (5) and (8), and the possible number is 1,. Probability p=[(2c1)(2c1)(6c2)+2·( 2c2)(2c1)(6c1)+1] (10c4)=17 42