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asked ago in Mathematics by (21.4k points)

Let vector a = i – j, b =  i +  j +  k  and vector c  be a vector such that a x c + b = 0 and a · c = 4 , then |c|2 is equal to :

(1)  9

(2)  8

(3)  17/2

(4)  19/2

1 Answer

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answered ago by (18.6k points)
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Best answer

Correct option  (4)  19/2

Explanation:

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