If the vectors 3overset(^)i+overset(^)j-...

If the vectors `3overset(^)i+overset(^)j-5overset(^)k and aoverset(^)i+boverset(^)j-15overset(^)k` are collinear, if

`a=3,b=1`

`a=9,b=1`

`a=3,b=3`

`a=9,b=3`

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