How to calculate C (subscript 10, superscript 5)

10*9*8*7*6/5*4*3*2*1=252

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1. How does the permutation and combination formula CNM (n is subscript, M is superscript) = n! / m! (n-m)! Come from Please give an example
2. C, subscript 7, superscript 4, is a combination formula. How to calculate this? The answer is 35,
3. Proof of probability addition formula of three events ABC three events, proof P (aubuc). I know the formula, the process of proof Just look at the picture, I can understand. The key is to show it.
4. Does the independent event satisfy the probability addition formula
5. 0.56 * () + 0.44 * () + () = 6 () fill in the same number
6. Fill in 35 × 56 = 1960 19.6 = () × () = () × ()
7. Let a and B be two independent events that cannot happen at the same time In an event, the probability of occurrence of a and B is 30%. A and B are independent of each other and cannot occur at the same time. What are the percentages of occurrence probability of a and B? What is the formula? A and B are mutually exclusive, that is to say, after a occurs, B does not occur, and B occurs, then a does not occur, so the probability of occurrence of a or B can not be 30%. If it is still 30%, then the total probability of occurrence of a or B should be 60%, and the probability of both not occurring is only 40%, which is obviously wrong
8. What is the probability formula of independent events occurring simultaneously? What is the probability addition formula of mutually exclusive time? What are these probability formulas?
9. If the probability of event a occurring at least once in four independent repeated tests is 8081, then the probability of event a occurring in one test is 8081______ ．
10. In the four independent repeated trials, the probability of random event a occurring just once is not greater than the probability of its occurring just twice, then the probability of event a in one trial
11. A problem about C and a formula explained by classical probability If there are 6 tins of a certain beverage in each box, and 2 of them are unqualified, ask the quality supervision personnel to randomly select 2 tins from them, and what is the probability of detecting unqualified products? I can list them, but the teacher gave me two more methods. The algorithms of C and a are not very good. They can only calculate, let alone understand them 1）P=[A(2,2)+C(2,1)C(4,1)A(2,2)]/6X5=3/5 2)[C(2,2)+C(2,1)C(4,1)]/C(6,2)=3/5
12. What's the probability C with a superscript of 0 and a subscript of 4?
13. How to make subscript and superscript in computer
14. In mathematical probability statistics, C (m, n), where m is the superscript and N is the subscript, how to calculate?
15. How to use word to type the number in the root sign, the superscript and subscript of Σ, and the superscript and subscript of ∫
16. On the problem of mathematical permutation number formula, a-n-m (subscript n, superscript m) = n! Divided by (n-m)! Why? Detailed derivation process, I have not learned this formula, permutation and permutation number, but I still do not know the meaning of this formula, do not know what the formula is? How does the formula of anm = n · (n-1) · (n-2) · (n-3) ···· 3x2x1 come from,
17. Senior high school mathematics problems (independent repeated test) 1. Assuming that the probability of event a occurring at least once in four independent repeated experiments is 80 / 81, try to find the probability of event a occurring in another experiment 2. Someone shoots at a target until it is hit. The probability of each shot hitting the target is 1 / 3. Calculate the probability of hitting the target for the nth time
18. (2014 · anqing simulation) in three independent repeated tests, the probability of event a occurring in each test is the same. If the probability of event a occurring at least once is 6364, the probability of event a occurring just once is () A. 14B. 34C. 964D. 2764
19. If the probability of event a occurring at least once in four independent repeated tests is 8081, then the probability of event a occurring in one test is 8081______ ．
20. The probability of a appearing at least once in four independent repeated events is 0.59. What is the probability of a appearing in one test?