Let a = i + 2 j + k , b = 3 i - 3 j + 3 k , c = 2 i - j + 2 k and d be a vector such that b d = c d and a . d...

Question

Let a = i + 2 j + k , b = 3 i - 3 j + 3 k , c = 2 i - j + 2 k and d be a vector such that b d = c d and a . d = 4. Then | a d |^2 is equal to ______.

Accepted Answer

128

JEE Main 2025 Mathematics question