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Question

nN
1+12+13+........+1n=Sn
then Sn=?

A
n
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B
<n
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C
n
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D
n
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Solution

The correct option is C n
sn=n2[a+l]
sn=n2[1+1n]
sn=n2[1+nn]
sn=n+n2
snn

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