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DiKsa [7]
3 years ago
6

Algebra 2 urgent assistance.

Mathematics
1 answer:
DedPeter [7]3 years ago
5 0

1 + 2 + 3 + ... + n = \dfrac{n(n + 1)}{2}

7 + 14 + 21 + ... + 105 =

= 7(1 + 2 + 3 + ... + 15)

= 7(15)(16)/2

= 840

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