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A ,B ,C and D have position vectors vec...

`A ,B ,C and D` have position vectors ` vec a , vec b , vec ca n d vec d ,` respectively, such that ` vec a- vec b=2( vec d- vec c)dot` Then a. `A Ba n dC D` bisect each other b. `B Da n dA C` bisect each other c. `A Ba n dC D` trisect each other d. `B Da n dA C` trisect each other

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