1.

If bar(a)=bar(i)+bar(j), bar(b)=bar(j)+bar(k), bar(c)=bar(i)+bar(k), then the unit vector in the opposite direction of bar(a)-2bar(b)+3bar(c) is

Answer»

`1/(3sqrt(2))(4bar(i)-BAR(J)+bar(K))`
`-1/(3sqrt(2))(4bar(i)-bar(j)+bar(k))`
`1/(3sqrt(2))(bar(i)-4bar(j)+bar(k))`
`1/(3sqrt(2))(bar(i)+bar(j)-4bar(k))`

Answer :B


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