Click to Chat

1800-2000-838

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
`        find the sum upto n terms  of the series: (with proper steps)2+4+9+17+28+..........`
3 years ago

Arun Kumar
IIT Delhi
256 Points
```										Hello Student,
$\\T_r=t_{r+1}-t_{r} \\t_{r+1}=T_r+t_{r}=T_r+T_{r-1}+t_{r-1}... \\T_r=2+(r-1)3 \\2+(2+T(1))+(2+T(1)+T(2))+(2+T(1)+T(2)+T(3)).... \\=>2*n+\sum_{1}^{n-1}\sum{T_r} \\=>2*n+\sum_{1}^{n-1}{r(4+(r-1)3) \over 2} \\=>2*n+\sum_{1}^{n-1}{r(1+3r) \over 2} \\=>2n+\sum_{1}^{n-1}{r \over 2}+\sum_{1}^{n-1}{3r^2 \over 2} \\=>2n+{(n-1)n \over 4}+{(2n-1)n(n-1) \over 4 }$
Thanks & RegardsArun KumarBtech, IIT DelhiAskiitians Faculty
```
3 years ago
Think You Can Provide A Better Answer ?

## Other Related Questions on Algebra

View all Questions »
• Complete JEE Main/Advanced Course and Test Series
• OFFERED PRICE: Rs. 15,900
• View Details