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Mario and Bowser begin with a hat that has 5 b***s in it: 3 are red, 2 are green. Bowser secretly picks a ball and tells Mario it is red, although he might be lying about the color. If there is an 80% chance Bowser is lying, what is the probability that Mario draws 2 red b***s in a row after Bowser's initial draw?

 Aug 9, 2016
 #3
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It turns into b***s if you type b***s. That actually is B a L L s

 

If Bowser drew a green one, which means he is lying......

There is 75% that Mario's initial draw is red

And 66 2/3 % that Mario's second draw is red.

Multiply them together = 50%.

 

There are 80% chance that he has a 50% probability to draw 2 red ones in a row.

Therefore 80% x 50% = 40%

He has a 40% probability now.

 

If Bowser drew a red one, which means he isn't lying.....

There is 50% that Mario's initial draw is red

And 33 1/3 % that Mario's second draw is red.

Multiply them together = 16 1/6 %

 

There are 20% chance that he has a 16 1/6% probability to draw 2 red ones in a row.

Therefore 20% x 16 1/6% = 3 1/3%

He has a 40% + 3 1/3% probability now.

 

Therefore Mario has a 43 1/3% probability to draw 2 red b***s in a row.

 Aug 10, 2016
edited by MaxWong  Aug 10, 2016

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