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when toggle format what by license comment
May 20, 2014 at 0:45 comment added Joe thanks a lot for the pdf; I eventually got to the right answer (which was also suggested by @whuber)
May 19, 2014 at 20:12 history edited heropup CC BY-SA 3.0
deleted 3 characters in body
May 19, 2014 at 20:12 comment added heropup Because I misinterpreted the question to be $B_i = A_i + ki$ instead of just $k$. I will edit.
May 19, 2014 at 16:31 history answered heropup CC BY-SA 3.0