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If [vecbvecc vecd]=24 and (vecaxxvecb)xx...

If `[vecbvecc vecd]=24` and `(vecaxxvecb)xx(veccxxvecd)+(vecaxxvecc)xx(vecd xx vecb)+(vecaxxvecd)xx(vecbxxvecc)+kveca=0` then k is equal to …………….

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