Question

Which term of the AP is 21,18,15... Is -81?
Also,is any term 0? Give reason for your answer.

Answer 1

Answer:

hope this helps u

Step-by-step explanation:

The given A.P is 21,18,15.....

so,

a=21

a+d=18

∴d=−3

now

a(nthterm)=a+(n−1)d

⇒0=a+(n−1)d

⇒0=21+(n−1)(−3)

⇒n−1=  -21/-3

​⇒n−1=7

⇒n=7+1

∴n=8

Hence,the required term is 8.

​