trying to figure out a truth table

Question

A v B

B

therefore ~A

Answer 1

The conclusion does not necessarily follow...

The truth value of A does not affect the statement A or B , since B is given.

Here's the truth table ( you may have to fix the columns, as the browser messes them up)

which does NOT produce a tautology

A B ~A A v B all given (AvB) * B given ---> ~A

T T F T T F

T F F T F T

F T T T T T

F F T F F T