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Question

In a parallelogram with vertices A(\overline a),B(\overline b),C(\overline c),D(\overline d),,E(\overline e)$ is midpoint of digonal AC then

A
¯¯¯e=¯¯¯a+¯¯c2
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B
¯¯¯e=¯¯¯d+¯¯b2
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C
¯¯¯e=¯¯¯a¯¯c2
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D
¯¯¯e=¯¯¯d¯¯b2
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Solution

The correct options are
A ¯¯¯e=¯¯¯a+¯¯c2
C ¯¯¯e=¯¯¯d+¯¯b2
Given
E(e) is the mid point of diagonal AC
by parallelogram law
diagonal AC
AC=a+c
position vector of E
e=a+c2
Hence option A is correct

diagonal AC in other triangle ACD
AC=d+b
position vector of E
e=d+b2


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