Question

in an AP 24.21,18.is a term...than which term becomes the first negative no..
a:8th b: 9th c:10th d:12th​

Answer 1

Answer:

c) 10th

Step-by-step explanation:

an = a + (n - 1) × d where d = -3, Let an = 0

⇒ 0 = 24 + (n - 1) × -3

⇒ 0 = 24 - 3n + 3

⇒ 3n = 27

⇒ n = 9

⇒ 10th term will be negative (-ve)

I hope this may help you