KEAM 2015 Math Paper

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Question : 30 of 120
 
Marks: +1, -0
Let i2=−1, Then
(i10−
1
i11
)
+(i11−
1
i12
)
+(i12−
1
i13
)
+(i13−
1
i14
)
+(i14−
1
i15
)
=
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