Paragraph: There are five students S 1 , S 2 , S 3 , S 4 and S 5 in a music class and for them there are five seats R 1 , R 2 , R 3 , R 4 and R 5 arranged in a row, where initially the seat R i is allotted to the student S i , i = 1,2 , 3,4 , 5 . But, on the examination day, the five students are randomly allotted the five seats Question : The probability that, on the examination day, the student S 1 gets the previou