document.write( "Question 1181767: What is the S12 for tn= 2(3) ^(n-1)
\n" ); document.write( "S12 means Sum of 12
\n" ); document.write( "I attempted this several times and I got, 1062882, another time I got 531440.\r
\n" ); document.write( "\n" ); document.write( "I appreciate any help. \n" ); document.write( "

Algebra.Com's Answer #811660 by MathLover1(20850) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( " $\"sum%28+2%2A3%5E%28n+-+1%29%2Cn=1%2C12%29=531440\"$ \r
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\n" ); document.write( "\n" ); document.write( "check by finding all terms:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"t%5B1%5D=+2%283%29+%5E%281-1%29=2\"$
\n" ); document.write( " $\"t%5B2%5D=+2%283%29+%5E%282-1%29=2%2A3%5E1=6\"$
\n" ); document.write( " $\"t%5B3%5D=+2%283%29+%5E%283-1%29=2%2A3%5E2=18\"$
\n" ); document.write( " $\"t%5B4%5D=+2%283%29+%5E%284-1%29=2%2A3%5E3=54\"$
\n" ); document.write( " $\"t%5B5%5D=+2%283%29+%5E%285-1%29=2%2A3%5E4=162\"$
\n" ); document.write( " $\"t%5B6%5D=+2%283%29+%5E%286-1%29=2%2A3%5E5=486\"$
\n" ); document.write( " $\"t%5B7%5D=+2%283%29+%5E%287-1%29=2%2A3%5E6=1458\"$
\n" ); document.write( " $\"t%5B8%5D=+2%283%29+%5E%288-1%29=2%2A3%5E7=4374\"$
\n" ); document.write( " $\"t%5B9%5D=+2%283%29+%5E%289-1%29=2%2A3%5E8=13122\"$
\n" ); document.write( " $\"t%5B10%5D=+2%283%29+%5E%2810-1%29=2%2A3%5E9=39366\"$
\n" ); document.write( " $\"t%5B11%5D=+2%283%29+%5E%2811-1%29=2%2A3%5E10=118098\"$
\n" ); document.write( " $\"t%5B12%5D=+2%283%29+%5E%2812-1%29=2%2A3%5E11=354294\"$ \r
\n" ); document.write( "\n" ); document.write( "sum:\r
\n" ); document.write( "\n" ); document.write( " $\"2%2B6%2B18%2B54%2B162%2B486%2B1458%2B4374%2B13122%2B39366%2B118098%2B354294=531440\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"531440=531440\"$ \r
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