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How to solve this equation to find f(n), where f(n)=1+p*f(n+1)+q*f(n-1). p,q are constant and p+q=1. We...

How to solve this equation to find f(n), where f(n)=1+p*f(n+1)+q*f(n-1). p,q are constant and p+q=1. We already know two point f(0)=f(d)=0, d is a constant number.

what is f(n) as a function with p,q,d,n?

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