1.

Which term of an AP: 21; 18; 15;....... is -81?

Answer» formula is = a+(n-1)×d-81=21+(n-1)×(-3)-81=21+(n-1)×(-3)-81=21-3n+3-81=24-3n-81-24=-3n-105=-3n105=3n105÷3=n35=n


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