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| 1. |
Find the sum of AP 101+99+97+........+47 |
| Answer» a=101,d=101-99= -2, last term (an) =47 an=a+(n-1)d 47=101+(n-1)-2 -54=(n-1)-2 n-1=27 n =28 Sn = n/2*(a+l) = 28/2*(101+47) = 14*148 = 2072 | |