જો $\mathop {\rm{A}}\limits^ \to \,\, = \,\,4\hat i\,\, + \,\,n\hat j\,\, - \,\,2\hat k$ અને $ \mathop B\limits^ \to \,\, = \,\,2\hat i\,\, + \;\,3\hat j\,\, + \;\,\hat k$ હોય તો $n$ કિમત ..... હોય જેથી $\mathop {\rm{A}}\limits^ \to \,\, \bot \,\,\mathop B\limits^ \to \,$ થાય .
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