If vec(A)= 7hat(i) + 2hat(j) - 3hat(k) and vec(B) = hat(i) + hat(j) + 2c hat(k) are perpendicular vectors, the value of c is

If vec(A)= 7hat(i) + 2hat(j) - 3hat(k) and vec(B) = hat(i) + hat(j) +

1.	If vec(A)= 7hat(i) + 2hat(j) - 3hat(k) and vec(B) = hat(i) + hat(j) + 2c hat(k) are perpendicular vectors, the value of c is
Answer» `-1.5` 1.5 3 zero Answer :B