Samuel2132 Samuel2132

08-11-2017
Mathematics

contestada

find the sum of the first twenty terms of an arithmetic progression
16+9+2+(-5)+...

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dannielle dannielle

08-11-2017

16 + (16-7)+ (16-2*7)+(16-3*7)+.......+ (16-19*7)=
20*16-7(1+2+....+19)=20*16-7*19*20:2=320- 1330= -1010

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