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ધારોકે $\vec a \, = \,\,\,\hat j\, - \,\,\hat k$ અને $\vec c \, = \,\,\hat i\, - \,\hat j\, - \,\,\hat k\,\,\,$ અને $\vec a \,\, \times \,\,\vec b \,\, + \;\,\vec c \,\, = \,\,\vec 0 $ અને $\,\vec a .\,\vec b \, = \,\,3$ ને સ્વીકારતા સદીશ $\,\vec b \,\,....$

• A
  $ - \,\hat i\, + \,\hat j\, - \,\,2\hat k\,$
• B
  $2\hat i\, - \,\hat j\, + \,\,2\hat k\,$
• C
  $\,\hat i\, - \,\hat j\, - \,\,2\hat k\,$
• D
  $\,\hat i\, + \,\hat j\, - \,\,2\hat k\,$