find the sum of - 1/3 - 4/5
hope this helps1/(23) can be written as 1/2 - 1/3.1/(34) can be written as 1/3 - 1/4.And so on until1/(49*50) can be written as 1/49 - 1/50.When you add up this series, you get 1/2 - 1/50, which is 24/50 which is 12/25.
