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sqrt(4+sqrt(4-sqrt(4+sqrt(4-......oo))))...

`sqrt(4+sqrt(4-sqrt(4+sqrt(4-......oo))))=? `

A

`(sqrt(13)+1)/2`

B

`(sqrt(17)+1)/2`

C

`(sqrt(11)+1)/2`

D

`(sqrt(21)+1)/2`

Text Solution

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The correct Answer is:
a
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