Question

the value of 1/15+2/35+1/63+1/99+1/143 is _______

Answer 1

[tex] \frac{1}{3*5} + \frac{1}{7*5} + \frac{1}{7*9} + \frac{1}{9*11} + \frac{1}{11*13} = (\frac{1}{3} - \frac{1}{y13} )/2 = \frac{5}{39} [/tex]