Algebra - Also answer

1

~AjInKyA~ ·2009-04-09 08:22:24

2nd one , formula
n into n+1 into 2n+1 divided by 6
1st put n 20 than 4
then subtract 1 fm 2 !

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

Akand ·2009-04-09 08:22:30

3...

Tn=n(n+1)(2n+1)/6
Sn=Î£Tn

thts all

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

Akand ·2009-04-09 08:23:34

1st one

Tn=1/nxⁿ⁺¹
then find Sn

UP 0 DOWN 0
Post on FacebookPost anonymously?

6

nix_13 12 ·2009-04-09 08:24:53

what if in (3) instead of n terms we have 10 terms........then what will be the answer???

UP 0 DOWN 0
Post on FacebookPost anonymously?

6

nix_13 12 ·2009-04-09 08:25:22

similarly for (1) also??

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

~AjInKyA~ ·2009-04-09 08:25:29

1st one
1 1 1 1 1
- + - + - + - + -
1 2 3 3 4

n so on
rest will cancel

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

~AjInKyA~ ·2009-04-09 08:26:14

ah , my hand fingerws r now paininggggg

UP 0 DOWN 0
Post on FacebookPost anonymously?

1

Akand ·2009-04-09 08:27:39

3...

if 10 is given
solve for n and substitute n as 10

TOO LENGHTY

use shortcuts

UP 0 DOWN 0
Post on FacebookPost anonymously?

11

virang1 Jhaveri ·2009-04-09 09:08:24

3.
The nth term will be Î£n²
Therefore summation of the series will be Î£Î£n²
Î£n(n+1)(2n-1)/2
1/2Î£(n²+n)(2n-1)
1/2Î£2n³ + 2n² - n² -n
1/2Î£2n³ + n² -n
n²(n + 1)²/2 - n(n+1)/2
This the answer to the third summation of series
n(n+1)/2 [ n(n+1) -1]

UP 0 DOWN 0
Post on FacebookPost anonymously?

Also answer

9 Answers

Your Answer

Similar Questions

Also answer

9 Answers

Your Answer

Add Image

Similar Questions