Question

which term of the AP 85,78,71,... is its first negative term ? if the order of this term is n,find Sn.

Answer 1

HIIIII..

HERE IS YOUR ANSWER......

IN THIS AP

A=85 ; D=78-85= -7

SO NEGATIVE TERM MEANS

 A+(N-1)D<0

 85+(N-1)(-7)<0

85-7N+7<0

-7N<-92

N>13.14

SO, LET N=14

HENCE,  14TH TERM IS FIRST NEGATIVE TERM

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Answer 2

Answer:

Hey mate

please mark as brainlist answer