Please provide correct answer for these 2 questions. Please

And give short explanations about how to do these kind of questins. Thanks

Select the best answer Consider these page references (time is progressing left to right): 2 4 7 2 4 X 7 6 452 5 2 The objective is to select the page to replace using Least Recently Used. Assume that when Reference X is made, the main memory for this process contains these pages: 4 7 2 Select the page to replace. 4 None of these answers 2 7