Question

which term of an AP 71,68,65.... is it's first negative term
no spam​

Answer 1

Answer:

25th term

Step-by-step explanation:

First term = 71

Com. dif = 68 - 71 = -3

Let nth term be the first -ve term:

 ⇒ nth term is - ve

 ⇒ nth term is less than 0

 ⇒ a + (n - 1)d < 0

 ⇒ 71 + (n - 1)(-3) < 0

 ⇒ 71 - 3n + 3 < 0

 ⇒ 74 < 3n

 ⇒ (24.666) < n

n greater than 24.666... means next term is 25, and hence first negative term is 25th term./

Answer 2

Answer:

25

Step-by-step explanation:

Hopefully it's helpful to you!!