Let a = i + j + k and b = j - k . If c is a vector such that a c = b and a . c =3, then a .( b c ) is equal...

Question

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

Accepted Answer

(A)

JEE Main 2021 Mathematics question