document.write( "Question 1204431: Determine whether 280 is a term in the G.P 1,3,9,27… \n" ); document.write( "
Algebra.Com's Answer #853477 by ikleyn(53618)\"\" \"About 
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\n" ); document.write( "Determine whether 280 is a term in the G.P 1,3,9,27…
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\n" ); document.write( "\n" ); document.write( "Good question !\r
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\n" ); document.write( "\n" ); document.write( "The solution is very simple: each term of the GP is a degree of 3;
\n" ); document.write( "so, in particular, starting from the second term, each term is a multiple of 3.\r
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\n" ); document.write( "\n" ); document.write( "From the other side, the number 280 is NOT a multiple of 3 (just because
\n" ); document.write( "the sum of its digits, 2+8+0 = 10 is not a multiple of 3).\r
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\n" ); document.write( "\n" ); document.write( "So, the number 280 is not a member of the given G.P.         ANSWER.\r
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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