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Question

nn=11log2n (a)=

A
n(n+1)2loga 2
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B
n(n+1)2log2 a
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C
(n+1)2n24log2a
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D
None of these
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Solution

The correct option is A n(n+1)2loga 2
nn=11log2n (a)
=nn=1loga 2n
=nn=1nloga 2.
=loga 2.nn=1n
=loga 2.n(n+1)2
=n(n+1)2loga2

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