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8-n
n=number x 1 and n2 is n x n
n - 7 = 9 n = 16
For any index n (>1) calculate D(n) = U(n) - U(n-1). If this is the same for all integers n (>1) then D is the common difference. The sign of D determines whether the common difference is positive or negative.
Whats n+8