There are 9 acts in a talent show. A comedian, a dancer, a guitarist, a juggler, a magician, a pianist, a singer, a violinist, and a whistler. A talent show host randomly schedules the 9 acts. Compute the probability of each of the following events. Event A: The first four acts are the whistler, the singer, the magician, and the pianist, in any order. Event B: The dancer is first, the pianist is second, the magician is third, and the whistler is fourth. Write your answers as fractions in simplest form.