If P(A) = 0.3, P(B|A) = 0.4, P(B|not A) = 0.7, then P(B) is:

If P(A) = 0.3, P(B|A) = 0.4, P(B|not A) = 0.7, then P(B) is:

If P(A) = 0.3, P(B|A) = 0.4, P(B|not A) = 0.7, then P(B) is:



  1.     0.28
  2.     0.12
  3.     0.61
  4.     0.7