Use Exercise 1 to find a formula for
(Compare with Exercise 2.)
Exercise 1
Suppose that Δan = bn Show that
This formula is analogous to the calculus formula where Dg = f (D is the derivative operator). In the calculus formula, sum is replaced by integral, and Δ is replaced by derivative.
Exercise 2
Using induction, verify that the equation is true for every positive integer n.
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