Question

find the 31st term of an ap if the 3rd term is 4 and 9th term is -8 which term of A.P is zero

Answer 1

Answer:

31st term = -52 and 5th term is 0

Step-by-step explanation:

Let the first term be "a" and the common difference be "d"

So, 3rd term = a + 2d = 4

9th term = a + 8d = -8

Solving these two equations, we get a = 8 and d = -2

So 31st term = a + 30d = 8 + 30(-2) = 8 - 60 = -52

To find which term of A.P is 0, you can directly see the pattern as it is 8, 6, 4, 2, 0, -2, -4,......and so on

So, the 5th term is 0