Question: How many different combinations of scores by individual judges were given to the contestant competing against Mukul Dev?
Schema: create table table_18278508_6 (scores_by_each_individual_judge varchar, co_contestant__yaar_vs_pyaar_ varchar, PRIMARY KEY (scores_by_each_individual_judge))
SQL: select count(scores_by_each_individual_judge) from table_18278508_6 where co_contestant__yaar_vs_pyaar_ = "mukul dev"