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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).

Computational Intelligence online material, ©David Poole, Alan Mackworth and Randy Goebel, 1999

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