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Q 2250667514.     Let the vectors `vec(a) , vec(b) , vec(c)` and `vec(d)` be such that

`( vec(a) xx vec(b) ) xx ( vec(c) xx vec(d) ) = vec(0)`. Let `p_1` and `p_2` be planes

determined by the pairs of vectors `vec(a), vec(b)` and `vec(c) ,vec(d)`

respectively. Then the angle between `p_1` and `p_2`

A

`0`

B

`pi/4`

C

`pi/3`

D

`pi/2`

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