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Question

Evaluate:
13n=1(inin+1)

A
i
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B
i1
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C
i+1
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D
0
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Solution

The correct option is B i+1
Solution : -13n=1(inin+1)

=i1i2+i2i3+i3i4+...+i13i14

=i1i14

=i(i4)3.i2

=ii2=i+1

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