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karena rumus deret nya
Un = n^2 - 1
misal
U1 = 1^2 - 1 = 1 - 1 = 0
U2 = 2^2 - 1 = 4 - 1 = 3
jadi n^2= 728 + 1 =729
n=√729
n = 27
moga membantu