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The volume of a tetrahedron formed by...

The volume of a tetrahedron formed by the coterminous edges ` vec a , vec b ,a n d vec c` is 3. Then the volume of the parallelepiped formed by the coterminous edges ` vec a+ vec b , vec b+ vec ca n d vec c+ vec a` is `6` b. `18` c. `36` d. 9

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