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

Can anyone help me out
The value of (-2a)(-3a) is?
Here is a pattern made from sticks: ////// ////////// ////////////// How many sticks would be in pattern number 6?
Someone can help me in this question!
why natural fas is not used as a bottled gas or as a motor fuel?
Which of the following best explains the Missouri Compromise of 1820? As violence against slaves increased, the government created a haven for runaway slaves in
Whoever helps me gets a brainlist
In a class of students, the following data table summarizes how many students passed a test and complete the homework due the day of the test. What is the proba
Iūlia in cubiculō suō rosam ante nāsum _________________. a) tenet, b) claudit, c) lacrimat, d) advenit.
what is the value of the expression (2/3-5/6) divided by 3/4