1 .	Each edge of a regular tetrahedron is 3 cm, then its volume is – A.9$\sqrt2\over4$ $cm^3$ B.27$\sqrt3$ $cm^3$ C.4$\sqrt2\over9$ $cm^3$ D.9$\sqrt3$ $cm^3$
[ A ]    a [ B ]    b [ C ]    c [ D ]    d
Answer : Option A Explanation :
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