Correction

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def pascal(n):
    triangle = [[1]]
    for k in range(1, n+1):
        ligne_k = [1]
        for i in range(1, k):
            ligne_k.append(triangle[k-1][i-1] + triangle[k-1][i])
        ligne_k.append(1)
        triangle.append(ligne_k)
    return triangle