A) 5
B) \[-24\]
C) \[-5\]
D) \[120\]
E) \[24\]
Correct Answer: C
Solution :
Given,\[a=2i-7j+k,\text{ }b=i+3j-5k\] and \[a.mb=120\] \[\Rightarrow \]\[(2i-7j+k).(mi+3mj-5mk)=120\] \[\Rightarrow \]\[2m-21m-5m=120\] \[\Rightarrow \]\[-24m=120\] \[\Rightarrow \] \[m=-5\]You need to login to perform this action.
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