回答編集履歴
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せっかくndarrayにしているのですから、`C = A + B` で良いでしょう。
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```Python
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4
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5
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>>> lst1 = [1, 2, 3]
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6
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7
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>>> lst2 = [10, 20, 30]
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8
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>>>
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10
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11
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>>> lst1 + lst2
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12
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[1, 2, 3, 10, 20, 30]
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>>>
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>>> arr1 = np.array(lst1)
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>>> arr2 = np.array(lst2)
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>>>
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22
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>>> arr1 + arr2
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array([11, 22, 33])
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```
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