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You can tell this is an arithmetic sequence because it is a list of terms beginning with -19 that increase by 6 each term. Because of this, we can use the formula for the sum of an arithmetic sequence, which is:
is the number of terms in the sequence
is the starting term
is the common difference among the terms
In this case, we can see that ,
, and
. Thus, we can use the formula:
Our answer is 10,521.