Sum of 9 terms of an arithmetic sequence is 900. Find 5 th term
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If a series is arithmetic the sum of the first n terms, denoted Sn , there are ways to find its sum without actually adding all of the terms.
To find the sum of the first n terms of an arithmetic series use the formula, n terms of an arithmetic sequence use the formula,
Sn=n(a1 + an)2 ,
where n is the number of terms, a1 is the first term and an is the last term.
Step-by-step explanation:
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