\(F=\dfrac{5}{6}.\dfrac{11}{3}-\dfrac{5}{3}.\dfrac{8}{6}\\ =\dfrac{5}{6}.\dfrac{11}{3}-\dfrac{5}{6}.\dfrac{8}{3}\\ =\dfrac{5}{6}.\left(\dfrac{11}{3}-\dfrac{8}{3}\right)\\ =\dfrac{5}{6}.\dfrac{3}{3}=\dfrac{5}{6}.1=\dfrac{5}{6}\)
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\(F=\dfrac{5}{6}\cdot\dfrac{11}{3}-\dfrac{5}{3}\cdot\dfrac{8}{6}=\dfrac{55}{18}-\dfrac{20}{9}=\dfrac{55}{18}-\dfrac{40}{18}\)
\(=\dfrac{15}{18}=\dfrac{5}{6}.\)
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