Saved Bookmarks
| 1. |
6.The sum of the series 4 + 16 +36 +64 + ....... + 400 is-(1) 1530(2) 1540(3) 1550(4) 1560 |
|
Answer» let s be the given series,s=4+16+36+64+.......+400s=4(1+4+9+16+.....100)let,n=1+4+9+16+....+100n=0+1+4+9+16+...+100The relation between terms is the odd number added to the last term.the series will ben= 1+4+9+16+25+36+49+64+ 81+100n =385s=4(385)s=1540ans is b option b is the correct answer of the given question the option b is true s=1540 |
|