Nitish Shukla
Oct 12, 2020, 9:05:16 AM10/12/20
to Discussion forum for Mathematics for Data Science I
clearly given that lines intersect at an acute angle (theta) and an obtuse angle (phi) so theta and phi can never be 90 and hence m1*m2 is never equal to -1.
so option (b) should also be correct. 
Ankit Beura
Oct 12, 2020, 11:37:35 AM10/12/20
to Discussion forum for Mathematics for Data Science I, shukla...@gmail.com
Hi Shukla,
Exactly! If two lines are intersecting and not producing right angles means m1*m2 is not equals to -1.
Regards,
Ankit
Mathematics 1 Support 2
Oct 17, 2020, 2:22:34 AM10/17/20
to Discussion forum for Mathematics for Data Science I, ankitbe...@gmail.com, shukla...@gmail.com
Hi everyone.
You are right and the question is updated.
Best wishes,
Rahul
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