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JEE Advanced 2019 Paper 2

Section: Mathematics
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Question : 45 of 54
 
Marks: +1, -0
Suppose
det|
n
∑
k=0
k
n
∑
k=0
‌nCkk2
n
∑
k=0
‌nCkk
n
∑
k=0
‌nCk3k
|=0
Holds for some positive integer n. The
n
∑
k=0
‌nCk
k+1
 equals______
[JEE Adv 2019 P2]
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