in Set set associative We apply LRU . yes
and We know When Associative Is “ n “ then It will Work As a Fully Associative and When associative Is “ 1 “ then It will Work As a Direct mapping i think You agree with me…..
Then we Also Say that Direct mapping is Also a kind Of Set associative Mapping And when LRU is Applicable To Set associative , then It is also applicable in Direct mapping .