Which one of the following statements is correct? Oa. P(AUBC) =P(A") + P(B') - P(A'n BC) Ob. P(AUB) =P(A) + P(B) - P(AnB) Oc. P(AUB') =P(A") + P(B) - P(An B) Od. P( A U BC) = P(A") + P(B') + P(A 'n B' )