If a =2 i + j +2 k , then the value of | i ( a i ) |^2+ | j ( a j ) |^2+ | k ( a k ) |^2 is equal to...

Question

If a =2 i + j +2 k , then the value of | i ( a i ) |^2+ | j ( a j ) |^2+ | k ( a k ) |^2 is equal to _________.

Accepted Answer

18

JEE Main 2020 Mathematics question