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Simplify 2√7- 14/√7+7/√21

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Simplify 2√7- 14/√7+7/√21

A.

2121

B.

72121

C.

213

D.

3√21

Correct answer is C

2√7-  14/√7 +7/√21

L.C.M is √21

2127314+721

=273143+721

143143+721

=721

or 

7×2121×21 

7×2121 or  213