Let a = i + j + k , b and c = j - k be three vectors such that a b = c and a . b =1. If the length of...

Question

Let a = i + j + k , b and c = j - k be three vectors such that a b = c and a . b =1. If the length of projection vector of the vector b on the vector a c is l, then the value of 3l^2 is equal to _____.

Accepted Answer

2

JEE Main 2021 Mathematics question

Solution