Saved Bookmarks
| 1. |
Find the sum of odd integers from 1to2001? |
|
Answer» Use the formulas Sn=n/2(a+l) The series of odd integers from 1 to 2001 is,1,3,5,7..............,2001a=1d=3−1=2l=2001an\u200b = a+(n−1)d2001=1+(n−1)22000=2(n−1)∴n=1001Sn\u200b=n/2 \u200b[a+l]=1001/2 \u200b[1+2001]=10,02,001 |
|