document.write( "Question 326095: A partial sum of an arithmetic sequence is given. Can you please help me find the sum?
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Algebra.Com's Answer #233447 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
\"S=%28n%28a1%2Ban%29%29%2F2=%2815%285%2B75%29%29%2F2=600\"
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