1.

If the vector bar(a)=2bar(i)+3bar(j)+6bar(k) and bar(b) are collinear and abs(bar(b))=21" then "bar(b)=

Answer»

`pm(2BAR(i)+3BAR(j)+6bar(k))`
`PM3(2bar(i)+3bar(j)+6bar(k))`
`BAR(i)+bar(j)+bar(k)`
`pm21(2bar(i)+3bar(j)+6bar(k))`

Answer :B


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