If for all , then is equal to
- (A)48
- (B)24
- (C)42✓ Correct
- (D)18
Answer: (C)
Solution
(Expanding along the first column: .)
Differentiating using the product rule for determinants (differentiate one row at a time and sum), then evaluating at :
JEE Main · 2024 · 31 Jan 2024 · Shift 1 · Single correct option