Let a = 2 i + j - k, b = (( a ( i + j)) i) i. Then the square of the projection of a on b is:

JEE Main 2024 Mathematics question

Let , . Then the square of the projection of on is:

Answer: (B)

= (1, −1, −1)... = (−(−1)·... ): compute (2, 1, −1) × (1, 1, 0) = (1, −1, 1). Crossing with twice: (1, −1, 1) ×

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Question ID VK-012134