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

please help real quick ​
PLEASE HELP!! (1/5) -50 POINTS-
For lunch, you get tacos that cost $5.50. You also get chips and salsa for $3.99. What is the total cost of your lunch?
What orbits around the nucleus
NEED HELP ASAP PLEASE
PLEASE!! HELP!! Choose the option that completes the sentence and describes the image using the impersonal se. Me alegro mucho porque en esta tienda, sí _______
Fill in the blank: Juan experienced a _____ memory during therapy for depression. This type of memory is a memory that is formed, but never really happened. Dur
Given: AB tangent at D, AD = OD = 4 Find: Area of the shaded region
Consider the production function Y = (K)^1/2 (N)^1/2 where Y is output, K is capital, and N is the number of workers (abor) When K = 46 and N = 82, output is
Glucose has formula C6 H12 O6.Calculate the number of Oxygen atoms present in 18 g of glucose​