Question

Which term of AP 121,117,113...is negative?

Answer 1

Answer:

Given,

a = 121

d=-4

Let,

a n= -1

- 4n=-124

n= 31

Answer 2

Answer:

a=121 d =117-121=-4

an <0

an=a+(n-1)d

an<0

121+(n-1) -4<0

-4n×4 <-121

n<-121/4×-4

n<-121/-16

n<121/16

n<7.56

first negative term is 8th

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