which term of A.P. 21, 18, 15, ... is -81?
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a=21 d=-3 an=-81
We know that an=a+(n-1)d
-81=21+(n-1)-3
-81-21=-3n+3
-102-3=-3n
-105=-3n
n=35
We know that an=a+(n-1)d
-81=21+(n-1)-3
-81-21=-3n+3
-102-3=-3n
-105=-3n
n=35
AyyAn11:
right ans
thanks
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