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 = .3  and  q = .7  and n = 12

nCx = 

P(2< x <9) = P(x > 2)- P(x ≥ 9) = .7455 - .0017 = .7438 

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