document.write( "Question 823499: The sum of the first n terms of the Arithmetic Progression 13, 16.5 , 20 is the same as the sum of the first n terms of the Arithmetic progression 3 , 7 , 11 .calculate n. \n" ); document.write( "

Algebra.Com's Answer #495592 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "The sum of the first n terms of the Arithmetic Progression  13, 16.5 , 20  
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document.write( "is the same as the sum of the first n terms of the Arithmetic progression 3, 7, 11   
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document.write( "calculate n.
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document.write( " |Multiplying thru by 2/n
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document.write( "       26 + 3.5n - 3.5 = 3 + 4n - 4
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document.write( "         26  - 3.5 +1= .5n
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document.write( "                 23.5 = .5n 
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document.write( "                     n = 47  
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document.write( "   CHECKING our answer***
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