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| 1. |
Find the sum of odd integer 1to2001 |
| Answer» A=1,an=a+(n-1)d,2001=1+(n-1)2,2000=2n-2,N=1001,Sn=n/2(2a+(n-1)d),Sn=1001/2(2002),Sn=1001*1001, | |