document.write( "Question 1118156: I need the formula used\r
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\n" ); document.write( "\n" ); document.write( "n 1,2,3,4
\n" ); document.write( "f(n) 4,8,12,16 \n" ); document.write( "

Algebra.Com's Answer #733427 by ikleyn(52790) $\"\"$ $\"About$

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\n" ); document.write( "f(n) = 4n.\r
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