document.write( "Question 619019: what is the sum of the series of S7 for 5+10+20+40+.. \n" ); document.write( "
Algebra.Com's Answer #389270 by ewatrrr(24785)\"\" \"About 
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document.write( "Hi
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document.write( "what is the sum of the series of S7 for 5+10+20+40+..
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document.write( "Geometric Series:  r = 2
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document.write( "\"a%5Bn%5D+=+5%282%29%5E%28n-1%29\"
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document.write( "\"S%5Bn%5D=+a%5B1%5D%28%281-r%5En%29%2F%281-r%29%29\"
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document.write( "\"S%5B7%5D=+5%28%281-2%5E7%29%2F%28-1%29%29\" = 635 \n" );
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