How many have been replaced where the appointment date is 10 December 2007 and the manner of departure is quit?
create table table_11713303_2 (replaced_by varchar, date_of_appointment varchar, manner_of_departure varchar, PRIMARY KEY (replaced_by))
select count(replaced_by) from table_11713303_2 where date_of_appointment = "10 december 2007" and manner_of_departure = "quit"