Probability

There are five students S1,S2,S3,S4 and S5 in a music class and for them there are five seats R1,R2,R3,R4 and R5 arranged in a row, where initially the seat Ri is allotted to the student Si=1,2,3,4,5.But, on the examination day, the five students are randomly allotted the five seats.

For i=1,2,3,4, let Ti denote the event that the students Si and Si+1 do NOT sit adjacent to each other on the day of the examination. Then, the probability of the event T1∩T2∩T3∩T4 is