Manipal Entrance Test 2016 Math Paper

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Question : 7 of 70
 
Marks: +1, -0
If tu=
n
Σ
r=0
1
(nCr)k
and Sn=
n
Σ
r=0
r
(nCr)k
, where k∈Z+, then cos−1(
Sn
ntn
)
is
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