First ten terms of 12-n
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I am not sure....
that is, it increases or decreases by a constant amount each term), and you want to find the sum of the first n terms.
Denote this partial sum by S n . Then
S n = n ( a 1 + a n ) 2 ,
where n is the number of terms, a 1 is the first term and a n is the last term.
The sum of the first n terms of an arithmetic sequence is called anarithmetic series .
Example 1:
Find the sum of the first 20 terms of the arithmetic series if a 1 = 5 and a 20 = 62.
S 20 = 20 ( 5 + 62 ) 2 S 20 = 670
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what is a term
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if i knew what a term was i could help you
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