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Question: 2016 Fall Final - 12

Author: Michiel Smid
You roll a fair red die and a fair blue die, independently of each other. Let $r$ be the result of the red die and let $b$ be the result of the blue die. Define the events
  • A = "$r + b = 6$",
  • B = "$b = 4$".
What is $\Pr(B|A)$?
(a)
1/5
(b)
1/3
(c)
1/6
(d)
1/4