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Question

It is given that r=11(2r1)2=π28, then r=11r2 is equal to

A
π224
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B
π23
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C
π26
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D
None of these
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Solution

The correct option is D π26
r=1Σ1(2r1)2=π28

112+132+152+172+........=π28

I=112+122+132+142+15+162+172
I=(122+142+162.......)+(112+132+........)

=122(112+122+132..........)+π28
4II4=π28
4II4=π28
3I4=π28
I=π26

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