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Question

If Sn=nr=1r1.3.5.7....(2r+1) then?

A
Sn=12[111.3.5....(2n+1)]
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B
S=12
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C
Sn=14[1+11.3.5....(2n1)]
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D
S=14
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Solution

The correct options are
A Sn=12[111.3.5....(2n+1)]
B S=12
Sn=nr=1r1.3.5.7....(2r+1)
12nr=12r111.3.5.7....(2r+1)
12nr=111.3.5.7....(2r1)11.3.5.7.....(2r+1)
12(111.3.5.7....(2r+1))
S=12(10)=(12)=

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