Who knows forty-nine?
Please cite/link your sources, if possible. At some point in the next few days, I will:
Upvote all interesting answers.
Accept the best answer.
Go on to the next number.
49 are the times that Nevuchadnetzar performed divination to see whether he'd be successful in conquering Jerusalem; each time Hashem made the results consistently show that it would be so. (Rashi to Ezekiel 21:28)