a, \(\frac{1}{1.2}\)+\(\frac{1}{2.3}\)+\(\frac{1}{3.4}\)+\(\frac{1}{4.5}\)+...........+\(\frac{1}{99.100}\)
b,\(\frac{2}{3.5}\)+\(\frac{2}{5.7}\)+\(\frac{2}{7.9}\)+.........+\(\frac{2}{35.37}\)
c,\(\frac{7}{7.9}\)+\(\frac{7}{9.11}\)+\(\frac{7}{11.13}\)+..........+\(\frac{7}{99.101}\)