If vectors 2i^+2j^-2k^, 5i^+yj^+k^ and -i^+ 2j^+2k^. are coplanar, the value of y is :

If vectors 2i^+2j^-2k^, 5i^+yj^+k^ and -i^+ 2j^+2k^. are coplanar, the value of y is :

  1. A

    81

  2. B

    36

  3. C

    23

  4. D

    9

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    Solution:

    For coplanar vectors A.B×C=0
    =2225y1122
    =22y2210+1210+y=0
    =y=23

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