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| 1. |
An a. P consists 50 terms and its last term is 20th and the d=2.find the first term of an ap |
| Answer» n=50,no. of termsl=20, last termd=2, common differencea=?, first termFormula l=a+(n-1)d20=a+(50-1)2a=-78\xa0\xa0 | |