Question

Which term of A.P.

21,18, 15, ___, ___, ___ is zero.​

Answer 1

Answer:

a=21

d=-3

$a_{n}$ = 0 = 21 +(n-1)-3

-21/-3 = n-1

therefore, n = 7+1 = 8

Please rate 5stars and BRAINLIEST if it helped you!!!!!!!!!!!!!!!!!!

Answer 2

Answer:

General term of A.P.

= Aₙ = a + (n-1)d

Here Aₙ = 0 , a = 21 , d = -3

= 0 = 21 + (n-1)(-3)

= 7 = n-1

∴ n = 8

∴ Zero(0) is 8th term of A.P