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Q)

If a=ˆi+2ˆj+3ˆk,b=ˆi2ˆj+ˆk,c=4ˆi3ˆj2ˆk and a+λb is perpendicular to c, then λ is equal to :


( A ) 3
( B ) 1
( C ) 2
( D ) 4

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