Question
Using binomial theorem, find the value of
$(0.9)^4$
$(0.9)^4$
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R = {(a, b) / b = |a – 1|, a ∈ Z, |a| < 3}

Calculate the coefficient of variation of the two brands and interpret the results.
$h(x)=\frac{\sqrt{x+5}}{5+x}$