|
Bog'liq 9709 s20 qp 12|
5
4
The
n
th term of an arithmetic progression is
1
2
3
n
−
15
.
Find the value of
n
for which the sum of the first
n
terms is 84.
[5]
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
................................................................................................................................................................
© UCLES 2020
9709/12/M/J/20
Do'stlaringiz bilan baham: |
|
|
