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Question: 2017 Winter Final - 13

Author: Michiel Smid
We flip a fair coin, independently, five times. Define the events
  • A = "the coin comes up heads exactly four times",
  • B = "the fifth coin flip results in heads".
What is $\Pr(A|B)$?
(a)
2/3
(b)
2/5
(c)
1/3
(d)
1/4