1.

If bar(AB)=2bara+barb and bar(AD) = bara-2barb " where " absbara=1, absbarb =1, (bara,barb) = 60^(@) are the adjacent sides of a parallelogram, then the length of the diagonal "bar(BD) is

Answer»

`SQRT13`
`SQRT7`
`sqrt12`
`SQRT10`

ANSWER :A


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