document.write( "Question 736767: Laura received an e-mail from Billy. After 10 minutes Laura forwarded it to 3 of her friends. After 10 minutes each of those 3 friends forwarded the message to 3 more friends. If the message was forwarded like this every 10 minutes, how many people had received Billy's e-mail after 50 minutes?
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Algebra.Com's Answer #449996 by mananth(16946) $\"\"$ $\"About$

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Laura received an e-mail from Billy. After 10 minutes Laura forwarded it to 3 of her friends. After 10 minutes each of those 3 friends forwarded the message to 3 more friends. If the message was forwarded like this every 10 minutes, how many people had received Billy's e-mail after 50 minutes?
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\n" ); document.write( "the email was sent every 10 minutes\r
\n" ); document.write( "\n" ); document.write( "Total emails 5\r
\n" ); document.write( "\n" ); document.write( "first email 3, 9,27 81, 243.....\r
\n" ); document.write( "\n" ); document.write( "it is a GP\r
\n" ); document.write( "\n" ); document.write( " $\"Sn=a%28r%5En+-1%29%2F%28r-1%29\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"Sn+=+3%283%5E5-1%29%2F%283-1%29\"$ \r
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\n" ); document.write( "\n" ); document.write( "Sn = 3*242/2\r
\n" ); document.write( "\n" ); document.write( "=363 emails will be sent in 50 minutes\r
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