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If a=3ˆi2ˆj+ˆk and b=ˆi+2ˆj+5ˆk, then the unit vectors along ab is :


( A ) 2ˆi+4ˆj+4ˆk34
( B ) 2ˆi+4ˆj+4ˆk6
( C ) none of these
( D ) ˆi2ˆj2ˆk3

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