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1999
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Q)
If the straight line $y=4-3x, \; ay = x + 10$ and $2y + bx + 9=0$ represents the three consecutive sides of rectangle, then $ab$ is equal to :
( A ) $-2$
( B ) $\frac{1}{2}$
( C ) $-\frac{1}{3}$
( D ) $18$
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