This is the concept of probability, we are required to calculate for the probability of rolling a 4 with a single die four times in a row; To solve this we proceed as follows; The probability space of a die is x={1,2,3,4,5,6} The probability of a die falling on any of this number is: P(x)=1/6 Thus the probability of rolling a 4 with a single die four times which makes up mutually exclusive events will be: 1/6*1/6*1/6*1/6 =(1/6)^4 =1/1296 The answer is B] 1/1296