If Ptotal=PA+PB=Xa+P*a+Xb+P*b and Xa=1-Xb and Xb=1-Xa
How can Ptotal=(P*B-P*A)Xb-P*A ?
In the initial expression, Xa is replaced by 1 - Xb, leaving:
P total = (1 - Xb) P * A + Xb * P * B
Ptotal = P * A - P * A * Xb + Xb * PB
Common factor of Xb is taken out:
P total = P * A + Xb * (P * B - P * A)
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If Ptotal=PA+PB=Xa+P*a+Xb+P*b and Xa=1-Xb and Xb=1-Xa How can Ptotal=(P*B-P*A)Xb-P*A ?
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