Web Reference: Your task is to return the sum of Triangular Numbers up-to-and-including the nth Triangular Number. Triangular Number: "any of the series of numbers (1, 3, 6, 10, 15, etc.) obtained by continued summation of the natural numbers 1, 2, 3, 4, 5, etc." Triangular Numbers cannot be negative so return 0 if a negative number is given. """ def sum_triangular_numbers (n): if n < 0: return 0 sum = sum_triangular_numbers (n-1) return sum + (n * (n + 1)) / 2 Sum of Triangular Numbers Your task is to return the sum of TriangularNumbers up-to-and-including the nth Triangular Number. Triangular Number: “any of the series of numbers (1,3,6,10,15,etc.) obtained by continued summation of the natural numbers 1,2,3,4,5, etc.”
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