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Consider the following recurrence: a 1 = 2 , a n = a n-1 + (2 n / 5) . (Note that an is defined

Consider the following recurrence: a1 = 2 , an= an-1 + (2n / 5) . (Note that an is defined only for integer values n 1.) Prove by induction on n that an=5n2+n+8 , for all integers n 1. (Note that when we solved this kind of recurrence relation using forward or backward substitution, we "guessed" the right answer by detecting a pattern. Once we detect the pattern and solve, we can use proof by induction to actually prove that our guess was correct. In this problem, we are verifying that our guess of an = 5n2+n+8is correct by using proof by induction.)

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