Question 130103
A JAR CONTAINS 3 WHITE MARBLES, 4 RED MARBLES,AND 5 BLUE MARBLES. FIND THE PROBABILITY OF CHOOSING THE GIVEN MARBLES WITHOUT REPLACEMENT. 
1. P(RED/BLUE) 

2.P(BLUE AND BLUE)

<pre>
How many marbles are you drawing?  Two?

What does P(RED/BLUE) mean? 

Does it mean the probability of getting
a RED and then a BLUE?  Or does it mean the probability of getting 
a BLUE 2nd given that you got a RED first?

P(RED first AND BLUE second) = {{{(4/12)(5/11)}}} = {{{5/33}}}
  
P(RED 2nd GIVEN BLUE 1st) = P(RED 2nd | BLUE 1st) = {{{4/11}}}

P (BLUE first AND BLUE 2nd) = {{{(5/12)(4/12)}}} = {{{5/36}}}

If these are not what you're looking for, then post again giving
all of the exact instructions, and I'll explain my answers better.

Edwin</pre>