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defisFibo(n):test_1=5*(n**2)+4test_2=5*(n**2)-4# If n is a fibonacci number then test_1 or test_2 must be a perfect squareifint(math.sqrt(test_1))**2==test_1orint(math.sqrt(test_2))**2==test_2:return'IsFibo'else:return'IsNotFibo'
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Is Fibo
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Python3: