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Question

If two perpendicular lines are having slopes m1 and m2. Then (m1m2)n will be ( n>0) 


  1. 1 always

  2. -1 always

  3. 2 always

  4. 1 or -1


Solution

The correct option is D

1 or -1


If two perpendicular lines are having slopes m1 and m2.

Then m1m2= -1

So (m1m2)n will be 1 or -1 depending on n.

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