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A-
A
A+
If
, then S
n
is equal to
1 + 2 + 2
2
+ …….2
r - 1
=1(2
r
- 1)/2 - 1
1 + 2 + 2
2
+ …….2
r - 1
=1(2
r
- 1)
5
, then Sn is equal to
, then Sn is equal to