Hi,

Note: The probability of x successes in n trials is: 

P = nCx*  

where p and q are the probabilities of success and failure respectively. 

In this case p = 1/6   q = 5/6

P(7 fives out of 17 rolls) = 17C7 (1/6)^7(5/6)^10 = .0112 

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