नियतांक P का मान, ताकि सदिश \(\vec a = 3 \hat i - 4 \hat j + 2 \hat k \)  एवं \(\vec b = 2 \hat i - 3 \hat j + p \hat k \) परस्पर लंबवत् हो, है- 

1
-4 
2
3
3
-3
4
-9

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