EddyFriedlund7016 EddyFriedlund7016
  • 04-07-2018
  • Mathematics
contestada

N a second grade class containing 12 girls and 11 boys, 2 students are selected at random to give out the math papers. what is the probability that both are girls?

Respuesta :

konrad509
konrad509 konrad509
  • 04-07-2018
[tex]\displaystyle |\Omega|=\binom{23}{2}=\dfrac{23!}{2!21!}=\dfrac{22\cdot23}{2}=253\\ |A|=\binom{12}{2}=\dfrac{12!}{2!10!}=\dfrac{11\cdot12}{2}=66\\\\ P(A)=\dfrac{66}{253}=\dfrac{6}{23}[/tex]
Answer Link

Otras preguntas

The first Europeans to discover lands in the western Atlantic were
Age is an achieved status true or false sociology 5
Too many nutrients is not good for bodies of water. This man-made is called what? A. Cultural eutrophication B. Point-source pollution C. Eutrophication
The game of european roulette involves spinning a wheel with 37 slots: 18 red, 18 black, and 1 green. a ball is spun onto the wheel and will eventually land in
How do u find these? What do they look like. 3 and 4 or either one
When did Christina Aguliera begin her career?
A limitation of retrovirus-mediated gene transfer is that ________.
Cara is entering college in the fall and plans to major in computer science. However, she isn't sure exactly what career she wants to pursue. What should Cara
Given the reaction below, which is the oxidized substance? Mg + Cl2 mc005-1.jpg Mg2+ + 2Clmc005-2.jpg 2CI- CI2 Mg Mg2+
The factor that has the greatest impact on your credit score is A. number of credit inquiries. B. payment history. C. types of credit in use.