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Question

Two lines are parallel and inclined at an angle less than 90 with the x-axis, then 



A

Product of their slopes = 1

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B

Product of their slopes = - 1

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C

=.

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D

None of these

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Solution

The correct option is D

None of these


If the two lines are parallel their slopes are equal.

Since, both the lines are inclined at an angle less than 90, their slope are positive.

So, nothing can be said except that their product is > 0.


Quantitative Aptitude

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