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Question

The points O,A,B,C are the vertices of a pyramid and P,Q,R,S are the mid-points of OA,OB,BC,AC respectively. If OA=a,OB=b,OC=c, express in terms of a,b,c the vectors OP,OQ,OR and OS/

A
OP=12a, OQ=12b, OR=12(b+c),OS=12(a+c)
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B
OP=12c,OQ=b,OR=12(b+c),OS=12(a+c)
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C
OP=12c,OQ=b,OR=12(a+c),OS=12(b+c)
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D
OP=12a,OQ=b,OR=12(a+c),OS=12(b+c)
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Solution

The correct option is A OP=12a, OQ=12b, OR=12(b+c),OS=12(a+c)
P,Q,R,S are the mid-points of OA,OB,BC,AC
P=AO2=a2
OP=PO
OP=a20
OP=a2
Q=b2
OQ=QO
OP=b20
OP=b2

R=b+c2
OR=RO
OR=b+c20
OR=b+c2

S=a+c2
OS=SO
OS=a+c20
OS=a+c2


656944_254736_ans_4cbb1e3c4aeb4d6bb5872d3b8bd3fad4.png

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