P(abCdef,abcDef,abcdEf,abcdeF,abcdef}=.681^2*.319+.681^3*.319+..

Sorry,I'm outside, a litttle carelessness.Thank you remind me,It should be:

P(notA)=P(notB)=...P(notF)=0.681.P(A)=P(B)=...=.319

So,P(notA*notB)=P(notA)*P(notB),they are independent.