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triangle_number.py
Views: 122 | Author: abh
def triangle_number(n):
    t = 0
    for i in range(1, n+1):
        t += i
    return t

def triangle_number(n):
    return sum(range(1, n+1))

def triangle_number(n):
    return (n*(n+1))//2

for n in range(10):
    print(triangle_number(n))

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