Paragraph: There are five students S _ 1 , S _ 2 , S _ 3 , S _ 4...

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 : For $i = 1, 2, 3, 4$ Let ${T}_{i}$ denote the event that the students ${S}_{i}$ and ${S}_{i + 1}$ do NOT sit adjacent to each other on the day of the examination. Then, the probability of the event ${T}_{1} \cap {T}_{2} \cap {T}_{3} \cap {T}_{4}$ is