Question 867192
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Hi
{{{P (x)= highlight_green(nCx)(p^x)(q)^(n-x) }}} 
p and q = .5,  n = 3
{{{P (3)= highlight_green(3C2)(.5^2)(.5)^1 =highlight_green(3)(.5^2)(.5)^1 = .375 }}} 
P( at least one tail) = 1 - P(none) = 1- (.5)^3 = .875