How do you evaluate 20P2?

Montenovofe 2022-07-05 Answered
How do you evaluate 20P2?
You can still ask an expert for help

Want to know more about Probability?

Expert Community at Your Service

  • Live experts 24/7
  • Questions are typically answered in as fast as 30 minutes
  • Personalized clear answers
Learn more

Solve your problem for the price of one coffee

  • Available 24/7
  • Math expert for every subject
  • Pay only if we can solve it
Ask Question

Answers (1)

Gornil2
Answered 2022-07-06 Author has 20 answers
Step 1
The general formula for a permutation is
n P r = n ! n - r !
Step 2
In this case, n = 20 and r = 2 , so our equation becomes
20 P 2 = 20 ! 18 ! = ( 20 × 19 ) = 380
Did you like this example?
Subscribe for all access

Expert Community at Your Service

  • Live experts 24/7
  • Questions are typically answered in as fast as 30 minutes
  • Personalized clear answers
Learn more

You might be interested in

asked 2021-08-19
Based on the Normal model N(100, 16) describing IQ scores, what percent of peoples
asked 2021-08-20
Let X be a normal random variable with mean 12 and variance 4. Find the value of c such that P{X>c}=.10.
asked 2021-08-19
Let X represent the difference between the number of heads and the number of tails obtained when a coin is tossed n times.
What are the possible values of X?
asked 2021-09-20
Four roads away from the country jail.
A prisoner has escaped from the jail and selects the road at random.
If road 1 is selected, the probabiltiy of escaping 1/8. if road 2 is selected , the probability of success is 1/6. if road 3 is selected, the probability of escaping is 1/4 and if road 4 is selected, the probability of succes is 9/10
What is the probability that prisoner will succeed in escaping?
asked 2021-09-14
A new car that is a gas- and electric-powered hybrid has recently hit the market. The distance travelled on 1 gallon of fuel is normally distributed with a mean of 45 miles and a standard deviation of 7 miles. Find the probability of the car travels less than 42 miles per gallon
asked 2022-02-13
Consider the following discrete probability distribution. What is the probability that x equals 7?
x3479P(X=x)0.220.17?0.18
asked 2020-11-10

If you are aware that two events, A and B, are independent P(A)=0.3, what is the value of P(A|B)?

New questions

i'm seeking out thoughts for a 15-hour mathematical enrichment course in a chinese language high faculty. What (pretty) simple concern would you advocate as a subject for any such course?
historical past/issues:
My students are generally pretty good at math, but many of them have no longer been uncovered to rigorous or summary mathematical reasoning. an amazing topic would be one that could not be impossibly hard for students who have by no means written or study proofs in English.
i have taught this magnificence three times earlier than. (a part of the purpose that i'm posting that is that i have used up all my thoughts!) the primary semester I taught an introductory range theory elegance (which meandered its way toward a proof of quadratic reciprocity, though I think this become in the end too advanced/abstract for some of the students). the second one semester I taught fundamental graph idea and packages (with a focal point on planarity and coloring). The 1/3 semester I taught a class at the Rubik's dice.
the students' math backgrounds are pretty numerous: a number of them take part in contest math competitions, and so are familiar with IMO-fashion techniques, however many aren't. a number of them may additionally realize some calculus, however I cannot assume it. all of them are superb at what in the united states is on occasion termed "pre-calculus": trigonometry, conic sections, systems of linear equations (though, shockingly, no matrices), and the like. They realize what a binomial coefficient is.
So, any ideas? preferably, i'd like to find some thing a bit "sexy" (like the Rubik's cube) -- tries to encourage wide variety theory through cryptography seemed to fall on deaf ears, however being capable of "see" institution idea on the cube became pretty popular.
(Responses specifically welcome from folks who grew up in the percent -- any mathematical subjects you desire were protected within the excessive college curriculum?)