In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
One example: This list contains the top 25 accounts with the most followers on the social photo-sharing platform Instagram. As of May 2018, the most followed user is Instagram's own account, with over 235 million followers. Selena Gomez is the most followed individual, with over 137 million followers. Ten accounts have exceeded 100 million followers on the site.
Solution is here: who has the maximum number of followers on instagram
Explanation: The answer is talking about the Instagram accounts that have the most followers. The question asking about the maximum number of followers. So this is a good example.

Now, solve this: If two vectors have the same direction (or have the exact opposite direction from one another, i.e. are not linearly independent) or if either one has zero length, then their cross product is zero. More generally, the magnitude of the product equals the area of a parallelogram with the vectors for sides; in particular, the magnitude of the product of two perpendicular vectors is the product of their lengths. The cross product is anticommutative (i.e., a b = b a (\ displaystyle \ mathbf (a) \ times \ mathbf (b) =-\ mathbf (b) \ times \ mathbf (a))) and is distributive over addition (i.e., a (b + c) = a b + a c (\ displaystyle \ mathbf (a) \ times (\ mathbf (b) + \ mathbf (c)) = \ mathbf (a) \ times \ mathbf (b) + \ mathbf (a) \ times \ mathbf (c))). The space R 3 (\ displaystyle \ mathbb (R) ^ (3)) together with the cross product is an algebra over the real numbers, which is neither commutative nor associative, but is a Lie algebra with the cross product being the Lie bracket.
Solution:
when will the cross product of two vectors be zero