Question

which term of the AP 21, 18, 15 is -81​

Answer 1

Answer:

Sorry l donot know the answer

Step-by-step explanation:

sorry i donot know plz....

sorry maf kor dena.......

Answer 2

Answer:

a = 21

d = -3

Term of an AP

a(n)= a +(n-1) *d

-18 = 21 + (n-1) * -3

-18 -21 = (n-1) *-3

- 39 = (n - 1) * -3

-39/-3 = ( n-1 )

13 = n-1

14 = n

Please follow me plz