1.

If |bar(a)|=2,|bar(b)|=4,|bar( c )|=1 and bar(a)+bar(b)=-bar( c ) then bar(a).bar(b)+bar(b).bar( c )+bar( c ).bar(a)=……………

Answer»

`-9.5`
`-10.5`
`10.5`
`7.5`

ANSWER :B


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