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The resultant of forces P and Q is R. If Q is doubled, then R is doubled. If the direction of Q is reversed, then R is again doubled, then p2:Q2:R2 is :


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

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