Let a = i +2 j -3 k and b =2 i -3 j +5 k . If r a = b r , r .( i +2 j + k )=3 and r .(2 i +5 j - k )=-1, R,...

Question

Let a = i +2 j -3 k and b =2 i -3 j +5 k . If r a = b r , r .( i +2 j + k )=3 and r .(2 i +5 j - k )=-1, R, then the value of +| r |^2 is equal to :

Accepted Answer

(B)

JEE Main 2021 Mathematics question