Find the sum of `n` terms of the sequence `(a_n),w h e r ea_n=5-6n ,n in Ndot`

Explanation

`a_{n}=5-6 n `


`a_{1}=-1 quad a_{2}=-7 quad a_{3}=-13 cdots `


`-1,-7,-13,-19,-25 ldots`


Resultant sequence is an Ap.


common difference =d


`=-7-(-1) `


`=-6 `


`text { Sum of } n text { terms :- } frac{n}{2}[2 a+(n-1) d] `


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