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

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

What is the intersection point for this system of equations? x + y = 49 .10x + .25y = 7.45

Which of the expressions are equivalent to the one below? Check all that apply. (5.1)-7 A. (15)-7 B. 5. (1+7) C. (5+1)-7 D. 7+ (15) apex. pic below.

Who wrote the gift of magic

Anglicanism is very similar to Catholicism in many of its beliefs and practices. Why is that the case?

what is 3(x - 7) + 4

The Bureau of National Affairs regularly surveys __________. A) Customer satisfaction B) CEO compensation levels C) HR activities, budget and staffing D) Polit

Males tend to prefer which type of gambling more than females?

Chris is walking at a speed of 3.25 miles per hour. If he continues to walk at the same speed, how far can Chris walk in 1.5 hours?

2. Which point of view does Saki use in "The Open Window" to build suspense and deliver a surprise ending? O first person O third-person limited O second person

A. Which of the following is the best estimate of the product 9 X 286? 10 X 200 = 2,000 9 X 200 1,800 9 x 300 2,700 10 X 400 4,000 A (В D