Which of the following is equivalent to \(\dfrac{\sqrt{21}}6?\)

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Which of the following is equivalent to \(\dfrac{\sqrt{21}}6?\)

A. \(\dfrac{\sqrt7}2\)

B. \(\dfrac7{12}\)

C. \(\sqrt{\dfrac72}\)

D. \(\sqrt{\dfrac7{12}}\)

E. \(\dfrac{7\sqrt3}2\)

Answer: D

Source: Veritas Prep

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Square of $$\sqrt{21}$$ /7 = 21/36 which is equivalent to 7/12.