probability in math
posted by puzzled .
can anyone help me with a probability question?

Usually someone can help. Advanced college level probability questions often go unanswered.
What is the question? 
Students in a given class were graded A, B, C, D, and F in proportions of 1:3:4:1:1, respectively.
How much information is contained in the message
(a) You passed
(b) You did not get a B
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