Question

which term is the first negative term in the given AP 23, 21.5 , 20,...?

Answer 1

a=23
d=-1.5
an=-1
n=?

an=a+(n-1)d
-1=23+(n-1)(-1.5)
-1-23=(n-1)(-1.5)
-24/-1.5=n-1
16=n-1
n=16+1
n=17

Answer 2

Answer: The first negative term will be at a17

Step-by-step explanation: A.P. : 23, 21/1/2, 20...….

a1=23

d=a2-a1

d=-3/2

d=-1.5

let an=-1

an=a+(n-1)d

-1=23+(n-1)(-1.5)

-1-23=(n-1)(-1.5)

-24=(n-1)(-1.5)

-24/-1.5=n-1

16=n-1

16+1=n

n=17

So the first negative term will be at a17

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