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Solution to part (c)
Suppose you had observed a value for variable A.
What other variables could have their belief changed as a result of
this observation?
Answer: B, C, D, E, and F.
All of the ancestors of A,
(namely B and C) and
all of their descendants (D, E, and F).
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material, ©David Poole, Alan Mackworth and Randy Goebel, 1999