document.write( "Question 841587: Using this formula sn=a1 (1-rN)÷1-r. Find the sum of 3+6+12+24...+192 \n" ); document.write( "
Algebra.Com's Answer #507018 by ewatrrr(24785)\"\" \"About 
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document.write( "Hi,
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document.write( "Find the sum of 3+6+12+24...+192    |Geometric, r = 2
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document.write( "\"a%5Bn%5D+=+a%5B1%5D%2Ar%5E%28n-1%29\"
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document.write( "First Find 'n'
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document.write( " \"+192+=+3%282%29%5E%28n-1%29\"
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document.write( "  \"64+=+%282%29%5E%28n-1%29\"    ⇒  (n-1) = 6, n = 7
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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+=+3%28%281-%282%29%5E7%29%2F%28-1%29%29+=+381\"
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document.write( "Wish You the Best in your Studies.
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