What is the fourth term of an AP of n terms
whose sum is n(n+1)
(a) 6
(b) 8
(c) 12
(d) 20
Answers
Answered by
1
Answer:
bro definitely the answer is 8.
Attachments:
anshverma26:
thks brother...but u have any other method
Answered by
1
Answer:
Option( b) 8
Step-by-step explanation:
Sn=n(n+1)
so
S4=4*5=20
s3=3*4=12
So A4=S4-S3
=20-12
=8
Option( b) 8
ok
but equation is not satisfied s4-s3=8
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