Mathematics, 02.07.2019 09:00 kelkel4731
Find the sum of the first 63 terms of –19, -13, -7 …
Answers: 1
![S = \dfrac{n}{2}[2 a_1 + d(n - 1)]](/tpl/images/1155/0436/08ddd.png)
is the number of terms in the sequence
is the starting term
is the common difference among the terms
, 
, and 
. Thus, we can use the formula:![S = \dfrac{63}{2} [2(-19) + 6(62)] = 10,521](/tpl/images/1155/0436/e9de5.png)
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Find the sum of the first 63 terms of –19, -13, -7 …...
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