thomas12 thomas12

05-12-2014
Mathematics

Answered

what is the sum of the first five terms in the series 7+12+17+..?

Answer :

crisforp crisforp

05-12-2014

7 + 12 + 17 + 22 + 27 = ( 7 + 27 ) + ( 12 + 22 ) + ( 34 / 2 ) = ( 34 / 1 ) + ( 34 / 1 ) + ( 34 / 2 ) = ( 68 / 2 ) + ( 68 / 2 ) + ( 34 / 2 ) = 170 / 2 = 85 .

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