The following box contains 9 letters shown. the letters are drawn one by one without replacement and the result are recorded in order.
find the probabilty of the outcome professor

These are 8 independent events 
P(P) = 1/9 
P(r )= 2/8
P(o) = 2/7   and so on until  only r is left  
These probabilities are multiplied together to give the  resulting  p(Professor)

So it will be 1/9 * 1/4 * 2/7* 1/6 * 1/5*1/2*1/3 * 1/2  = 2/ 90,720 = 1/45,360

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