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M and N are mid-point of the diagnols AC...

M and N are mid-point of the diagnols AC and BD respectivley of quadrilateral ABCD, then`bar(AB) + bar(AD)+bar(CB)+bar(CD)`=

A

4 `bar(OM)`

B

4 `bar(MN)`

C

2 `bar(MN)`

D

4 `bar(ON)`

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The correct Answer is:
A
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