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Of A(-2,-1),B(a ,0),C(4, b)a n dD(1,2) a...

Of `A(-2,-1),B(a ,0),C(4, b)a n dD(1,2)` are the vertices f a parallelogram, find the values of `aa n dbdot`

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Of (-2,-1),B(a,0),C(4,b) and D(1,2) are the vertices f a parallelogram,find the values of a and b.

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