1.

The vector a= lambda hat (i) + hat(j) + 2 hat (k) , vec(b) = hat(i) + lambda hat(j) - hat(k) and vec(c ) = 2 hat (i) - hat(i)- hat(j) + lambda hat(k) are coplanar if -

Answer»

` lambda = -2`
` lambda = SQRT(3) +1`
`lambda = 1 - sqrt(3)`
`lambda = 2`

ANSWER :A,B,C


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