Find the sum of the following A.P.'s : ...

Find the sum of the following A.P.'s :
(i) `3,8,13, .... ` to 20 terms. (ii) `1,4,7,.........` to 50 terms.
(iii) `8,5,2, ....` to 25 terms. (iv) `(a+b), (2a+3b), (3b+5b), ........ ` to n terms.

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Find the sum of the following A.P.'s :
(i) `3,8,13, .... ` to 20 terms. (ii) `1,4,7,.........` to 50 terms.
(iii) `8,5,2, ....` to 25 terms. (iv) `(a+b), (2a+3b), (3b+5b), ........ ` to n terms.