0 record will be additional deleted.
Since, table T1 has On delete cascade constraint, referenced record <3,8> of table T1 will be deleted and the referencing record <8,3> of table T2 will be deleted.
Since, Table T2 has on delete set Null constraint, when referenced record <8,3> of T2 will be deleted, the referencing records, <5,8> and <9,8> get updated to <5,null> and <9, null>.
So, no additional record will be deleted from table T1.