Question 464672
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Hi,
Note: The probability of x successes in n trials is: 
P = nCx* {{{p^x*q^(n-x)}}} where p and q are the probabilities of success and failure respectively. 
In this case p = .75 & q = .25
nCx = {{{n!/(x!(n-x)!)}}}
 P(3 strikes in 3 pitches) = 3C3 (.75)^3 = .75^3 = .4219
 P(3 strikes in 4 pitches) = 4C3(.75)^3*.25 = 4*(.75)^3*.25 = .4219 
 P(0 strikes in 4 pitches) = 4C0 (.25)^4 = .0039