Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
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 of 1.2+3.4+5.6+7.8+..................................................................

Find the sum of 1.2+3.4+5.6+7.8+..................................................................

Grade:12th pass

1 Answers

Shailendra Kumar Sharma
188 Points
3 years ago
Tr= (2r-1)(2r+2)
Tr = 4r2 +4r-2r-2
Tr= 4r2+2r-2
So Sn = \sum (4r2+2r-2)
Sn= 4{n(n+1)(2n+1)/6} +2 {n(n+1)}/2 -2n
    =2/3{n(n+1)(2n+1)+ n(n+1)-2n

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free