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Solution to part (f)
Suppose we now eliminate B. What factor(s) are removed, and what
factor is created?
Variable B appears in three factors: P(AB), P(B), and
f_{5}(B). We thus create a factor f_{6}(A), defined by:
A  Value 
true  0.88 * 0.7 * 0.476216 + 0.38 * 0.3 * 0.587992 = 0.360380144 
false  0.12 * 0.7 * 0.476216 + 0.62 * 0.3 * 0.587992 = 0.149368656

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material, ©David Poole, Alan Mackworth and Randy Goebel, 1999