Which term of an AP :21,18,15.......is -81?
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In the given series 21,18,15,.....is -81 showing this is decreasing AP
Common difference (d) is 18-25=-3
an=-81, a=21
According to formula
an=a+(n-1)d
21+(n-1)-3=-81
21+(n-1)=-81/-3
21+(n-1)=27
(n-1)=27-21
(n-1)=6
n=7
Hence 7th term of an AP is -81
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