Question

If a = (1, 1, 1), c = (0, 1, -1) are two
vectors and b
is a vector such that
āxb=c and a.b= 3, then b vector equals-
(A) (5, 2, 2) (B) (5/3, 2/3, 2/3)
(C) (2/3, 5/3, 2/3) (D) (2/3, 2/3, 5/3)​

Answer 1

Answer:

b=(5/3 2/3 2/3)is correct.

a.b=1(5/3)+1(2/3)+1(2/3)=1

|I j k |

axb= |1 1 1 |=(0 1 - 1)

|5/3 2/3 2/3|