Explain, in one sentence, why equals…

MATHEMATICS · Subjective · A Level · Mathematics · Sequences and series · Sequences and series

Problem

Explain, in one sentence, why ∑k=1n(ak+bk)\displaystyle\sum_{k=1}^{n}(a_k + b_k) equals ∑k=1nak+∑k=1nbk\displaystyle\sum_{k=1}^{n}a_k + \sum_{k=1}^{n}b_k.

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