A system uses 3 physical page frames which are initially empty. What is the absolute difference between the no. of page faults using the Least recently used(LRU) and Most recently used(MRU) page replacement policies while processing the page reference string given below ?

7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 2, 1, 2, 0, 1, 7, 0, 1