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Find the value of sqrt(21-sqrt(21-sqrt...

Find the value of
`sqrt(21-sqrt(21-sqrt(21-sqrt(21----oo))))`

A

`sqrt(85)+1`

B

`(sqrt(85)+1)/2`

C

`(sqrt(85)-1)/2`

D

Data Inadequate

Text Solution

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The correct Answer is:
C
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