Ta có :
\(B=1+\dfrac{1}{2}+\dfrac{1}{3}+........+\dfrac{1}{63}\)
Ta thấy :
\(1=1\)
\(\dfrac{1}{2}+\dfrac{1}{3}=\dfrac{1}{1+1}+\dfrac{1}{1+2}< \dfrac{2}{1+1}=\dfrac{2}{2}=1\)
\(\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{6}+\dfrac{1}{7}=\dfrac{1}{3+1}+\dfrac{1}{3+2}+\dfrac{1}{3+3}+\dfrac{1}{3+4}< \dfrac{4}{3+1}=\dfrac{4}{4}=1\)
\(\dfrac{1}{8}+\dfrac{1}{9}+...+\dfrac{1}{15}=\dfrac{1}{7+1}+\dfrac{1}{7+2}+....+\dfrac{1}{7+8}< \dfrac{8}{7+1}=\dfrac{8}{8}=1\)
\(\dfrac{1}{16}+\dfrac{1}{17}+...+\dfrac{1}{31}=\dfrac{1}{15+1}+\dfrac{1}{15+2}+...+\dfrac{1}{15+16}< \dfrac{16}{15+1}=\dfrac{16}{16}=1\)
\(\dfrac{1}{32}+\dfrac{1}{33}+...+\dfrac{1}{63}=\dfrac{1}{31+1}+\dfrac{1}{31+2}+...+\dfrac{1}{31+32}< \dfrac{32}{31+1}=\dfrac{32}{32}=1\)
\(\Rightarrow B< 1+1+....+1\) (\(6\) số 1)
\(\Rightarrow B>6\rightarrowđpcm\)
