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

Olive Oil costs $8.70 per liter. A restaurant owner buys 5.6 liter of olive oil. How much does the owner pay?
Round 5.19424860514 tho the 6 decimal
If you are not sure if a drug that has been prescribed for you is safe to combine with alcohol, you should?
Tex wants to make a lawn in the front of his house. The total yards are 30 by 30 yards he gets 20 by 10 yards. Is that enough and if so how much more does he ne
Please could someone help me ?
please help thanks❗​
How does the line "Her train of thought screeched to a halt" in the last paragraph affect the mood of the passage? It suggests that Zoë's mind goes blank when h
plz help me out somebody
if i wanted to stop smoking marijuana.. will there be a chance of me relapsing? like do i gotta wait a month for my brain to stop thinking about marijuana??
how does declaration reflect modern American value?​