1) \(A=\frac{3}{2^2}.\frac{8}{3^2}.\frac{15}{4^2}........\frac{899}{30^2}\) 2) B = \(\frac{4}{3.7}+\frac{4}{7.11}+\frac{4}{11.15}+......+\frac{4}{107.111}\)
3) C = \(\frac{2}{15}+\frac{2}{35}+\frac{2}{63}+.....+\frac{2}{399}\) 3) D = \(\frac{7}{10.11}+\frac{7}{11.12}+\frac{7}{12.13}+......+\frac{7}{69.70}\)
4) E =\(\frac{6}{15.18}+\frac{6}{18.21}+\frac{6}{21.24}+.....+\frac{6}{87.90}\)