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Задано масив arr розміром 3х3:
arr = np.array([[1,2,3], [4,5,6], [7,8,9]])
Як знайти суму елементів по рядкам
arr.sum(axis=1)
arr.sum(axis=0)
arr.sum()
arr.sum(rows)
arr.sum(axis=rows)
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