Fdtxjr

Did Nintendo change its mind about 68000 SNES?

Knife as defense against stray dogs

If I cast the Enlarge/Reduce spell on an arrow, what weapon could it count as?

Why didn't Héctor fade away after this character died in the movie Coco?

Why didn’t Eve recognize the little cockroach as a living organism?

label a part of commutative diagram

PTIJ: Which Dr. Seuss books should one obtain?

GPL v3 - Does freely distributed software that includes GPL licensed code also require sharing source?

Animating wave motion in water

What is the difference between something being completely legal and being completely decriminalized?

Why doesn't the chatan sign the ketubah?

Does convergence of polynomials imply that of its coefficients?

How can I query the supported timezones in Apex?

Why is participating in the European Parliamentary elections used as a threat?

Isn't the word "experience" wrongly used in this context?

Is there any common country to visit for uk and schengen visa?

Air travel with refrigerated insulin

How do you justify more code being written by following clean code practices?

Should I be concerned about student access to a test bank?

The English Debate

10 year ban after applying for a UK student visa

Error in master's thesis, I do not know what to do

Does fire aspect on a sword, destroy mob drops?

How to read string as hex number in bash?

Probability of third ball drawn

Discarding 2 balls without color known - probablity 3rd ball is redProbability to draw a white ball from the third box.initial probability , 2rd drawn is red ballProbability of a certain ball drawn from one box given that other balls were drawnWhat of the probability of drawing a blue ball in this example?Show the probability that the first red ball drawn is the $(k+1)$th ball drawn equals $binomr+b-k-1r-1/binomr+bb$What is the probability that the drawn ball is redTough Probability Question.Does drawn count effect probability?After $K$ balls are drawn, what is the probability that next ball drawn is green.

4

$begingroup$

Having a box containing 15 red and 7 blue balls. We want to draw 3 balls at random by these conditions on each draw:

• If the ball is red you set it aside


• If the ball is blue put it back in

What is probability that the third draw is blue? (If you get a blue ball it counts as a draw even though you put it back in the box.)

Can I say by these rules?

We have three balls drawn the total possibility is the sum of:

• Both the first two balls are red


• Both the first two balls are blue


• The first ball is red and the second is blue


• The first ball is blue and the second is red.

Then for each case I can calculate the probability of blue ball at third draw.

$
P=frac1522*frac1421*frac720+frac722*frac722*frac722+frac722*frac1522*frac721+frac1522*frac721*frac721
$

probability balls-in-bins

share|cite|improve this question

edited Mar 13 at 9:55

Cettt

1,888622

asked Mar 13 at 7:15

Ali J.Ali J.

484

New contributor

Ali J. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  If I understand what you're saying, this seems right.
  $endgroup$
  – Brian Tung
  Mar 13 at 7:20
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Seems right. Combinations are b * (bb + br+rb+rr)
  $endgroup$
  – Michael Paris
  Mar 13 at 7:21
  

  
  
  
  

add a comment | 

4

$begingroup$

Having a box containing 15 red and 7 blue balls. We want to draw 3 balls at random by these conditions on each draw:

• If the ball is red you set it aside


• If the ball is blue put it back in

What is probability that the third draw is blue? (If you get a blue ball it counts as a draw even though you put it back in the box.)

Can I say by these rules?

We have three balls drawn the total possibility is the sum of:

• Both the first two balls are red


• Both the first two balls are blue


• The first ball is red and the second is blue


• The first ball is blue and the second is red.

Then for each case I can calculate the probability of blue ball at third draw.

$
P=frac1522*frac1421*frac720+frac722*frac722*frac722+frac722*frac1522*frac721+frac1522*frac721*frac721
$

probability balls-in-bins

share|cite|improve this question

edited Mar 13 at 9:55

Cettt

1,888622

asked Mar 13 at 7:15

Ali J.Ali J.

484

New contributor

Ali J. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  If I understand what you're saying, this seems right.
  $endgroup$
  – Brian Tung
  Mar 13 at 7:20
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Seems right. Combinations are b * (bb + br+rb+rr)
  $endgroup$
  – Michael Paris
  Mar 13 at 7:21
  

  
  
  
  

add a comment | 

$begingroup$

Having a box containing 15 red and 7 blue balls. We want to draw 3 balls at random by these conditions on each draw:

• If the ball is red you set it aside


• If the ball is blue put it back in

What is probability that the third draw is blue? (If you get a blue ball it counts as a draw even though you put it back in the box.)

Can I say by these rules?

We have three balls drawn the total possibility is the sum of:

• Both the first two balls are red


• Both the first two balls are blue


• The first ball is red and the second is blue


• The first ball is blue and the second is red.

Then for each case I can calculate the probability of blue ball at third draw.

$
P=frac1522*frac1421*frac720+frac722*frac722*frac722+frac722*frac1522*frac721+frac1522*frac721*frac721
$

probability balls-in-bins

share|cite|improve this question

edited Mar 13 at 9:55

Cettt

1,888622

asked Mar 13 at 7:15

Ali J.Ali J.

484

New contributor

Ali J. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|cite|improve this question

edited Mar 13 at 9:55

Cettt

1,888622

asked Mar 13 at 7:15

Ali J.Ali J.

484

New contributor

Ali J. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|cite|improve this question

edited Mar 13 at 9:55

Cettt

1,888622

asked Mar 13 at 7:15

Ali J.Ali J.

484

New contributor

Ali J. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited Mar 13 at 9:55

Cettt

1,888622

edited Mar 13 at 9:55

Cettt

1,888622

asked Mar 13 at 7:15

Ali J.Ali J.

484

New contributor

Ali J. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked Mar 13 at 7:15

Ali J.Ali J.

484