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If a=hat(i)-2hat(j)+hat(k), b=hat(i)+3ha...

If `a=hat(i)-2hat(j)+hat(k), b=hat(i)+3hat(j)-2hat(k), c=2hat(i)+hat(j)-hat(k) " and "d=hat(i)+hat(j)+hat(k)`, then the volume (in cubic units) of the tetrahedron having `(a times b) times c, b, d` as its coterminuous edges is

A

`15/2`

B

90

C

`21/2`

D

`66/5`

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The correct Answer is:
C
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