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 #840673 by josgarithmetic(39618)![]() ![]() ![]() You can put this solution on YOUR website! Obviously not. Starting with 3, and then only powers of 3, and you know by LOOKING at 280, this is not a power of 3.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "In case you did not know or forgot, beginning with 3, any and all powers of 3 will have sum of the digits being equal to a multiple of 3. \n" ); document.write( "Look at 280. \n" ); document.write( "find sum of 2+8+0. \n" ); document.write( "That sum is 10. \n" ); document.write( "10 is very obviously not a multiple of 3. \n" ); document.write( " |