Answer
0.0017
Work Step by Step
$p1=9/16,p2=p3=3/16,p4=1/16,n=8,x1=1,x2=x3=3,x4=1$
$P=\frac{8!}{3!3!}(9/16)(3/16)^6(1/16)=0.0017$
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