document.write( "Question 465630: Find the sum of the following arithmetic series\r
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Algebra.Com's Answer #319064 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "3+9+15+21+...+57 
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document.write( "arithmetic series, d= 6
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document.write( "   57 = 3 + (n-1)6
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document.write( "   60 = 6n
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document.write( "    n = 10, 57 is the 10th term
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