In the sequence x0, x1, x2, ..., xn, each term from x1 to xk is 3 greater than the previous term, and each term from xk + 1 to xn is 3 less than the previous term, where n and k

are positive integers and k < n. If x0 = xn = 0 and if xk =15, what is the value of n?



5

6

9

10

15

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