Thank you for registering.

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

Please check your email for login details.
Close
MY CART (5)

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

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

⇐ BackProceed to Checkout ⇒
There are no items in this cart.
Continue Shopping

If the sum n.1+(n-1)+(n-2).3+.........+2.(n-1)+1.n is equal to A 1/6n(n+1)1 B 1/6n²(n+1) C 1/6n(n+1)(n+2) 1/6n(n+1)(2n+1)

If the sum n.1+(n-1)+(n-2).3+.........+2.(n-1)+1.n is equal to
A 1/6n(n+1)1
B 1/6n²(n+1)
C 1/6n(n+1)(n+2)
1/6n(n+1)(2n+1)

Grade:11

1 Answers

Arun
25763 Points
2 years ago
Dear student
 
the r th term will be r(n-r+1)
 
it is summation of r(n-r+1) where r varies from 1 to n;
 
SUM ( (n+1)r - r^2 ) = (n+1)(n)(n+1)/2 - (n)(n+1)(2n+1)/6

Think You Can Provide A Better Answer ?

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

Other Related Questions on Magical Mathematics[Interesting Approach]

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Register ICAT

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More