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The planes vecr.(2hati+3hatj-6hatk)=7 an...

The planes `vecr.(2hati+3hatj-6hatk)=7 and vecr.((-2)/7hati-3/7hatj+6/7hatk)=0` are (A) parallel (B) at righat angles (C) equidistant from origin (D) none of these

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