Question

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

Answer 1

a=21.
d=-3.
t(n)=-81.
t(n)= a+(n-1)d.
-81=21+(n-1)(-3).
-81-21=(n-1)(-3).
-102=(n-1)(-3).
-102/(-3)=n-1.
34=n-1.
So n=34+1.
i.e. n=35.
35th term will be -81.
8th term will be 0.

Answer 2

Answer:

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