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If the two equations ax^2 + bx + c = 0 and px^2 + qx + r = 0 have a common root, then the value of ( aq - bp ) ( br - cq ) is

( a ) - ( ar - cp )^2

( b ) ( ap - cr )^2

( c ) ( ac - pr )^2

( d ) ( ar - cp )^2

2
by sheila

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