Helppppppppppppppppppppppppppppppppppp

`C = 1/(11 xx 13) + 1/(13 xx 15) + 1/(15 xx 17) + ... + 1/(31 xx 33)`

`C = 1/2 xx (2/(11 xx 13) + 2/(13 xx 15) + 2/(15 xx 17) + ... + 2/(31 xx 33))`

`C = 1/2 xx (1/11 - 1/13 + 1/13 - 1/15 + 1/15 - 1/17 + .... + 1/31 - 1/33)`

`C = 1/2 xx 1/11 - 1/33`

`C = 1/2 xx 2/33`

`C = 1/33`

`.................`

`D = 1/(32 xx 34) + 1/(34 xx 36) + 1/(36 xx 38) + ... + 1/(62 xx 64)`

`D = 1/2 xx (2/(32 xx 34) + 2/(34 xx 36) + 2/(36 xx 38) + ... + 2/(62 xx 64)`

`D = 1/2 xx (1/32 - 1/34 + 1/34 - 1/36 + 1/36 - 1/38 + .... + 1/62 - 1/64)`

`D = 1/2 xx (1/32 - 1/64)`

`D = 1/2 xx 1/64`

`D = 1/128`