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यदि दी सरल रेखाओ की प्रवणताएँ क्रमश : `m _(1 )` तथा `m _(2 )` है तब रेखाएँ परस्पर लंबवत होगी यदि -

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यदि दी सरल रेखाओ की प्रवणताएँ क्रमश : `m _(1 )` तथा `m _(2 )` है तब रेखाएँ परस्पर लंबवत होगी यदि -
A. `m_(1)m_(2)=-1`
B. `m_(1)=m_(1)`
C. `m_(1)=-m_(2)`
D. `m_(1)m_(2)=1`
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1 Answer

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Correct Answer - A::B
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