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The vector a=αˆi+2ˆj+βˆk lies in the plane of the vectors b=ˆi+ˆjandc=ˆj+ˆk and bisects the angle between b and c.Then which one of the following gives possible values of α and β ?


( A ) α=1β=2
( B ) α=2β=2
( C ) α=2β=1
( D ) α=1β=1

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