CREATE TABLE table_50851 ("Name" TEXT, "Other names" TEXT, "Birth" TEXT, "Death" TEXT, "Death Place" TEXT, "Mother" TEXT)

when was birth when death place is n.a., other names is n.a. and name is wahid-un-nisa begum sahiba?
SELECT "Birth" FROM table_50851 WHERE "Death Place" = 'n.a.' AND "Other names" = 'n.a.' AND "Name" = 'wahid-un-nisa begum sahiba'
SELECT "Birth" FROM "table_50851" WHERE "Death Place" = 'n.a.' AND "Name" = 'wahid-un-nisa begum sahiba' AND "Other names" = 'n.a.'