If a = i + j +3 k , b =- i - j - k and c = i -2 j - k such that a . b =1 and b . c =-3, then 1 3 (( a b ). c...

Question

If a = i + j +3 k , b =- i - j - k and c = i -2 j - k such that a . b =1 and b . c =-3, then 1 3 (( a b ). c ) is equal to ——

Accepted Answer

2

JEE Main 2021 Mathematics question