Ta có :
\(C=1.3.5.7...99\Rightarrow C=\frac{1.3.5.7..99}{2.4.6.8..98}\Rightarrow C=\frac{1.3.5.7..9}{\left(2.2...2\right)\left(1.2.3..50\right)}\)( có 50 chữ số 2 )
\(\Rightarrow C=\frac{51}{2}.\frac{52}{2}.\frac{53}{2}...\frac{100}{2}\)
\(\Rightarrow C=D\)