I really need help to solve the following: T(n)=T(n-a)+n where a is a constant greather or equal 1.So I started to iterate T(n)=T(n-a)+n     =T(((n-a)+n)-a)+n     =T(3n-3a)+n     =T(((3n-3a)+n)-a)+n     =T(4n-4a)+nthis brings me to the Basic: T(kn-ka)+n. Is it right ? I am not sure how to solve such Terms with a constant ?thank you for your help !!
recurrence - Iteration method T(n)=T(n-a)+n
recurrence relation