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clearly, OA= i+j-k
OB= 2i-3j+4k
by triangle law,
OA+AB=OB
AB=OB-OA
AB= 2i-3j+4k -(i+j-k)= (2i-i) + (-3j-j) + (4k+k)= i-4j+5k
Therefoe, correct option is (C)
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