WBJEE 2014 Maths Solved Paper

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Question : 22 of 80
 
Marks: +1, -0
The value of the sum (
n
‌
C1
)
2
+ (
n
‌
C2
)
2
+ (
n
‌
C3
)
2
+ ...... + (
n
‌
Cn
)
2
is
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