C2 Series question Watch

Discutimos
Badges: 1
Rep:
?
#1
Report Thread starter 4 years ago
#1
"The sum of the first n terms of a sequence is n(n+2). find the first 3 terms of the sequence"

I have no idea where to begin with this, any ideas?
0
reply
shawn_o1
Badges: 21
Rep:
?
#2
Report 4 years ago
#2
Arithmetic series: find a and d given (n/2)(2(a-1)d) = n(n+2), then the first three terms are straightforward: a, a + d, a + 2d
1
reply
Discutimos
Badges: 1
Rep:
?
#3
Report Thread starter 4 years ago
#3
(Original post by shawn_o1)
Arithmetic series: find a and d given (n/2)(2(a-1)d) = n(n+2), then the first three terms are straightforward: a, a + d, a + 2d
Thanks, got it
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Thu, 25 Apr '19
  • University of the Arts London
    Open day: MA Footwear and MA Fashion Artefact Postgraduate
    Thu, 25 Apr '19
  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 27 Apr '19

Have you registered to vote?

Yes! (481)
37.78%
No - but I will (98)
7.7%
No - I don't want to (88)
6.91%
No - I can't vote (<18, not in UK, etc) (606)
47.6%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise