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Suppose that f (n) is a real valued func...

Suppose that `f (n)` is a real valued function whose domain is the set of positive integers and tha `f (n)` satisfies the following two properties `f (1) = 23` and `f (n+ 1)= 8+3 f (n)`, for `n >= 1`. It follows that there are constants `p, q` and `r` such that `f (n) = p . q^n - r`, for `n = 1, 2,...` then the value of `p+ q+ r` is

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