Math, asked by shindeyogini89, 3 months ago

oth
Find the sum of n terms of the series whose n^th
term is not n(n+1)​

Answers

Answered by AbhilabhChinchane
0

Answer:

Correct option is

A

3

n(n+1)(n+2)

T

n

=n(n+1)=n

2

+n

∴ Sum = S

n

=∑T

n

=∑n

2

+∑n=

6

n(n+1)(2n+1)

+

2

n(n+1)

=

6

n(n+1)

(2n+1+3)=

3

n(n+1)(n+2)

Hence, option 'A' is correct.

Answered by basavaraj5392
0

Tn = n(n+1) = n²+n

Sn = ∑Tn

= ∑n² +∑n

= [n(n+1)(2n+1)]/6 + [n(n+1)]/2

= [n(n+1)/6] {(2n+1+3)}=

= [n(n+1)(n+2)2]/6

= [n(n+1)(n+2)]/3

Above Attached, I Hope You Satisfied With My Answer.

If You Satisfied With My Answer Then Please Mark Me As Brainliest.

Similar questions