ISI 10+2 practice question

[RichaS]

The answer should be 35/429

[Abhitesh]

Correct

[RichaS]

Oh no, I'm looking for a step by step solution, i have no idea how to solve this  
Pleaseeeee help

[Abhitesh]

4*Tn = 1/(2n-1)(2n+1) - 1/(2n+1)(2n+3)