WBJEE 2014 Maths Solved Paper

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Question : 7 of 80
 
Marks: +1, -0
Let S =
2
1
n
‌
C0
+
22
2
n
‌
C1
+
23
3
n
‌
C2
+.....
2n+1
n+1
n
‌
Cn
. Then S equals
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