Có: \(\dfrac{1}{6}+\dfrac{5}{24}+\dfrac{7}{120}+\dfrac{7}{330}+\dfrac{3}{308}>\dfrac{1}{6}+\dfrac{5}{24}+\dfrac{7}{120}\)
\(\Rightarrow\dfrac{1}{6}+\dfrac{5}{24}+\dfrac{7}{120}+\dfrac{7}{330}+\dfrac{3}{308}>\dfrac{13}{30}>\dfrac{3}{7}\)
\(\Rightarrow A>B\)