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| 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 | |