I want to know the answer to the following question:
How many members of the Banu Qurayza were beheaded after surrendering to Muhammad and his followers according to Tabari and Ibn Hisham?
All the background I'm provided with is that "600-900 members of the Banu Qurayza were beheaded after they surrendered (according to Tabari and Ibn Hisham).". Is that enough to answer the question?