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Question: 2018 Winter Final - 13

Author: Michiel Smid

You are given a uniformly random bitstring of length five. Define the events

A = "the bitstring contains at most four 1's",
B = "the bitstring contians an odd number of 1's".

What is $\Pr(A|B)$?

(a)

14/16

(b)

12/16

(c)

13/16

(d)

15/16