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Vector Algebra question

2003 · Shift 0 · Q95

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PYQ Library
JEE Main
Mathematics
Vector Algebra
2003 · Shift 0 · Q95

Vector Algebra question

2003 · Shift 0 · Q95

JEE MainMathematicsVector AlgebraMCQ+4 / −1

A tetrahedron has vertices at

O(0,0,0), A(1,2,1) B(2,1,3)

and

C(-1,1,2).

Then the angle between the faces

OAB

and

ABC

will be :

A
${90^ \circ }$
B
${\cos ^{ - 1}}\left( {{{19} \over {35}}} \right)$
C
${\cos ^{ - 1}}\left( {{{17} \over {31}}} \right)$
D
${30^ \circ }$

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