NDA 2018 Mathematics question
Which one of the following factors does the expansion of the determinant contain?
Answer: (A)
Solution
Put : the first column becomes , identical to the third column, so the determinant vanishes. Hence is a factor.
Which one of the following factors does the expansion of the determinant contain?
Put : the first column becomes , identical to the third column, so the determinant vanishes. Hence is a factor.